I'm confused why one would purpose to tell me how I can play my game. Why do you care if I use premoves? Why SHOULD you care?
Pre-moves aren't available in OTB blitz, and they alter the nature of the game significantly. Your opponent would care if your pawn could suddenly capture straightforward - for some people, pre-moves are a change of a similar scale.
I don't know whether pre-moves will eventually overtake internet chess. Perhaps we'll one day see them as a normal, integral part of the game. But when someone suggested (14th century) that a pawn should move forward two squares on its first move, I imagine their opponent cared quite passionately. I'm not sure whether pre-moves are a change as beneficial as that, but you have to understand-when you use a non-universal rule, someone accustomed to a different rule set will naturally object.
Now I'm even more confused... how does they change the nature of the game? If anything, they are a HUGE risk for someone who doesn't konw what they are doing, and an advantage to said person's opponent. How is this any different than a person playing OTB bullet chess picking up a piece ON THEIR OPPONENTS TURN and having it in their hand ready to move after their opponent? If you watch high-level bullet chess, that happens all the time.
Anyone who thinks that premoves change the game as much as a pawn being able to take forward would change the game doesn't understand premoves.
I don't believe it is within the rules to touch a piece on their opponents turn (it might, for example, not enable the opponent to capture said piece).
Anyways, I play long games, so I don't care about pre-moves. You don't care about them for a different reason. But there are many who care passionately, so why shouldn't they have a choice to play within their ruleset (which is closer to the FIDE OTB ruleset).
too many ppl think they are entitled to a win.
if im winning on time, its really easy to destroy peoples premoves, and run them out. usually with a check.
if u have 30 seconds, and your opponent has 2 seconds in an equal or better position. you prolly suck if u lose.
i dont really even care about premoves compared to lag.
also, there probably is a huge correlation between the people who can use premoves and speed of playing chess. (please don't argue with small sample biases.)
also, its not like premoves are always conditional(sometimes they are with captures). it is very risky, and many games are lost just because they premove blundered