Open up another account, play yourself, and it will seem like 16 pre-moves.
why can you only make 8 premoves?

Open up another account, play yourself, and it will seem like 16 pre-moves.
multi accounting is highly discouraged.

agreed, there should be unlimited premoves so if you're playing a dead drawn endgame you can make 50 moves in 5 seconds flat
agreed

Did the number get changed? It used to be 5 premoves per turn max....
https://support.chess.com/customer/en/portal/articles/1444864-what-are-premoves-and-how-do-they-work-

Open up another account, play yourself, and it will seem like 16 pre-moves.
multi accounting is highly discouraged.
And this is what...your 8th account?
Who decided that 8 premoves was the perfect ammount of premoves? i think this is stupid. you should be able to make 11.