OGS actually has some lag compensation afaik.
Like way back here
there was some quite decent improvements that allowed you to play very fast games that weren’t really available beforehand.
Premoves are give and take, it’s not super easy to premove in Go (for me) but maybe people could get could at like premoving kos or the end game.
In any case what I’m getting at might be not displaying an error that covers the board and kind of makes it difficult to resubmit moves, but rather make the stone you just placed disappear again, so that you can try to replace it and have another quick attempt at resubmitting.
Sure the big error message lets you know there’s a problem, and it might be that in the short term you get some people say they did click and it didn’t submit and it wasn’t clear it didn’t submit. So maybe there’s some compromise in the middle - a smaller message (assuming people don’t see the internet icon) and an option to quickly resubmit the move 