These are phrases or descriptions I have just never used, GOAT and Game Changer, but Perfect I do use when someone or something is really close to perfection in some manner or matter.

But I don't use it every time I have a conversation or use it every day or...very often at all. Once in a while it slips out describing someone's rectal orifice.

Bob

I don't use "perfect," but I have been known to describe something or someone as "REALLY adequate."