Perhaps, but that would mean most of those games would never get shipped.
> If you calculate a hash ... instead of pulling in a huge library.
This is a bit of a strawman; what hash calcs require "a huge library"?
Another comparison is game modding which is essentially using the base game as the engine of your modded game. Do you think Team Fortress or Counter Strike or DOTA would have been made if their creators thought they have to build their own game engine?
Lowering the friction to make a game means more games get made. Yes there will be a flood of bad ones, but we get good one too.
If anything, not having to build an engine frees up more time to get creative with the actual game.
Most games are bad, of course, but Sturgeon's Law applies.