The tactics both players prepared and avoided before reaching the final position are sometimes tremendously more complicated than anything that was actually played in the game.
Threatening such tactics are also mechanisms to gain positional pluses like space, pawn structure, piece activity, king safety, etc.
If any of those 6 players were to play a 2000 rated player, the finishing tactics would likely be much more flashy.
Like probably most beginner/intermediate players I spend most of my time practising tactics, some of which are relatively easy and some of which are excruciatingly difficult. However when i look at master games, most of the decisive tactics are relatively simple, please consider the following.
or this famous one here,
and even this one here
You can see that these decisive tactics all came from master games and were for the most part fairly simple. this really got me wondering whether there is any benefit in studying really complicated tactics generated by computer? The reason I ask is that it appears to me that in the majority of instances the decisive tactical sequence is rather elementary. What do you guys think?