“X uses Y therefore Y is good” in general is a terrible argument. But also, Fortnite is a game. It’s for fun. 99% of their read/write throughput is in the context of a match, and matches are ephemeral.
Which is not his argument. His argument is "X uses Y, and X doesn't have problems with Y, so Y is good enough for X at least". Which is a completely valid thing to say.