Some of the Platonic forms only make sense when you consider that their language didn't really consider adjectives to be a thing.

"Hot" or "Large" or "Red" were considered something loke incomplete nouns that required other nouns to finish them. "Hot sand", "Large tree", etc.

Only then does it make sense to talk of forms of "The hot" or "The large"or, "The good"

If their language treated adjectives as we do, they may not have started to consider "The Good" a thing.