incidentally, I don’t believe in ‘perfect’ fusions. To my understanding, fusions are personifications of relationships and relationships are all wildly varied and unique and they vary from person to person. There’s no one way to have a good or stable relationship so I don’t think there’d be one way that a fusion has to look. The show revolves around a theme of that perfection doesn’t exist and that there’s more than one way to be, so I don’t feel like they’d have such a rigid definitive ‘perfect’ structure for one of the most abstract concepts in the show (fusions)
I do like the theory that different elements of a fusion may be reflective of the differences between the component Gems - separate eyes indicating a difference in perspective, separate arms being a difference in motivation/control. I’m not 100% on it but its an interesting concept and there’s stuff to work with there
But I don’t personally like the idea that the more humanoid a fusion, the more ‘perfect’ it is. I don’t think a fusion with only two arms is inherently better than one with four, nor a fusion with two eyes being better than one with four. While these can be indicative of serious problems in a relationship, sometimes you’re going to have an otherwise stable relationship where you don’t have the same exact perspective or motivations but it works in other ways. I just don’t think the ‘end goal’ of any of the fusions is to look exactly like a human (even Garnet has 3 eyes) but rather to be happy and find the balance between themselves. Because they’re personificiations of something so abstract and unique as the relationship between people, I feel it just cannot boil down to one "correct” relationship model. Or that it shouldn’t
But that’s just my perspective. I’m probably wrong but eh.