CitySushi
Andrew Wiggin's burner account
As a defensive replacement, it really doesn't matter. They can call timeout and get Curry back in the game. It only becomes a problem if they don't call a timeout or are out of timeouts.
Most fouls are completed on a rebound and are usually immediately called by the ref. I'm just going off my recollection, but I don't recall many times where the team has been able to call a timeout, in time before the opposition can take a foul.