I don't know how go changed. But as for chess the tournament play at the master level have insane deep opening preparation done before with computers. They play preparation game where they try to guess what lines the opponent checked and memorized before the games. They aren't actually playing until their computer backed preparation ends more than the few moves that they have fed in to come up with something different. Both spectators and players kind of find this a little bit boring.

I do acknowledge that this isn't a new phenomena Fischer complained about this before the computer engine era and came up with a chess variant to nullify deep opening prep!