The best in the world should be able to be good at all things. There should be three separate sections with equal weight: classical, rapid, and blitz. The winner needs to win the most sections, so 2 of 3, or 1 of 3 if two are drawn. In case of draw, then bullet, then Armageddon.
The best should actually be the best, not just the best at one thing.
I think @Dsmith42 brings up a good point. The point being in the fact that it takes a tactical enforcer with strong calculation to consistently beat other opponents to stop drawish games.
His words have truth. Reason being is because Kasparov was that type of player and so was Lasker as well.
Commonly, you are either 1 or 2 types of players:
1. You are either a positional mastermind (like Karpov) with great Endgame skill (like Carlsen)
2. Or you are a player who is great at making complications and is tactically dominant and somehow can shift the position into a winning game with great positional understanding.(like Kasparov or even Tal)[ I know, many people may not agree that Tal was the best pure positional player, but he was, he understood positions well enough to the point where he could break them down and build him up. No he was not a positional mastermind, and nowhere close, but it wouldn't be reasonable to say he wasn't a good positional player, it is just that he ways a way better tactical and calculator that he didn't even bother with the positional nature of the game, he just wanted to complicate and make dubious moves for dubious lines to make matters hard for his opponent. But it is good to know that later on in his life when Tal couldn't sustain his calculations, he became a positional player and was a good one]
This is what seems to make world champions as these players break the loop of drawish games. I do think that the people who are to the extreme of positional understanding, calculation, tactics or endgames face even the strongest of players, they will somehow win.
@NikkiLikeChikki
I don't think this is a forceful statement by @DSmith43, I think some things are great from which he says, and though I may not agree with everything, I do think it takes a person to be like a Kasparov or a Karpov to be a world champion or very successful player. Engines do make a difference however but in terms of strictly being on the next level drawish play would cease and the truth of the matter would be shown if you could push the win or not.
The reason Kasparov was great was due to the fact that he used to be everyone else that was not a drawing master. For the drawing masters he had to draw against unless he would lose, but everyone else he won for the majority. This is the common theme for the uphill climb to be world champion.
Also, this was doesn't only go for Kasparov, but Bobby Fischer as well and also Karpov. What they did was beat everyone they did was beat everyone with their style of play then draw against the drawing masters (such as Smyslov in his time).
Also the claim of @Dsmith42 seems valid to say that both players seemed more determine to not lose than win. As in that level with significant preparation and precision rarely would mistakes occur to the point of an outright loss and because of this most of the time, patience was key and the players would just have to hope they could keep making the strongest moves until an opening would arise.
Breaking someone who is not trying to lose is trying to break Smyslov, and even he was a world champion at one point. He wasn't a joke, and he has a positive score against Bobby Fischer with his drawing play style. He was the type of person who was a defensive tank and was quite literally seeking to draw you if he couldn't find a win, as he didn't really care for the win, he just didn't want to lose. Anish Giri is like the modern-day Smyslov, but Smyslov in his time was called the drawing master, and he was called the drawing master for a reason.
The reason this is important is because when talking about the breaking point of a person in chess, it is hard to beat them if they have a mentality to draw and not care for seeking to win. As there aim would be to draw and make it hard for their opponents to win. This lesson has been taught to Bobby Fischer many times in his playing days because every time he would play against the French he would try to push the position for the win and most of the time end up losing. It just shows you the differences in mentalities and how a breaking point is real.
I do disagree however with the fact that nobody spends 60-70 moves in a drawish endgame. That is actually the opposite of what happens sometimes, especially in the case of Magnus Carslen. It is debatable however when speaking on if people try to grind out Endgames a lot of the top Super-GM's try to do it in top tier competition for the most points. So I don't think that is entirely true, but it all depends on the position at hand.
On the claim that Lasker's opponents were horrible, that is just false. He played top tier competition, and sure they may to be as strong as today's SuperGM's they were no joke. Some of his opponents were Tarrash, Frank James Marshall, Rubienstien and Capablanca. These were some of the old masters and none of them were scrubs, so saying he had horrible opponents is just not true. They are called the "old masters" for a reason; they were definitely tough, perhaps tougher than some GM's and even Super GM's to this day. We will never know but it is always a possibility.
Regardless, it is true that there is needed for a certain balance for the leap of good players or good GM's, great GM's and world championship contending GM's. Honestly I just think that however in order to become a world champion or to be in the conversation you have to be masterful in either positional dominance, the Endgame or tactical skill and calculations, if you are dominant in one area of the game and just good/great in the rest becoming a world champion is probable. It just depends if you beat the rest of the competition and then draw the drawing masters, that is how I view it but everyone has their different opinions.
Anyways, just adding some clarification on the claim from what @DSmith42 was saying, and other comments in which I don't necessarily agree with fully, however is fine as we all have different viewpoints, this is what makes us human, so the more we share the better we can make the discussion!