Thats like building a house before making the foundation solid. You need to fix the game before adding tons of stupid stuff like flowerpots and stone fences.
the game isn't as broken as you're making it out to be, lol.
He could just write down the ideas like most people do, unless he's just really motivated to do them now like I sometimes do with some projects.
from my perspective, if I have an idea, i have to go make a sort of "proof of concept" or else i'll forget it.
even then, he's just having a little fun. sort of like a "i wonder if I can do this...", i'd do the same thing if I were a developer and so would a lot of other people :/