Explain.
EDIT: Oh! I construed this as a negative sentiment about Unicode, but perhaps it was just: "Yeah, it's complicated because language is complicated". Thanks, responders!
Case for example, why the heck would there be exactly two versions of A, one of which usually only appears at the start of words, and not always? Other people's squiggles don't do that, but notably several European writing systems (Latin and Cyrillic) do. People who use those systems think ABCDE and abcde are somehow "similar" even though they don't seem very similar at all. Then they're surprised other people don't do that.
The current state of emoji, unfortunately, makes this no longer true. (That being said, it's also designed in a way that's mostly ignorable if you don't need it. But only mostly.)
I understand why emoji is as complicated as it is. I don't think it was a good idea to bake that complication into Unicode.
It does not, and if you think it does it's obvious you didn't read UAX 29. GB11 is the most complex rule and only applies to emoji (well, and other Extended_Pictographics if you don't want to call the legacy pictographics emoji, but no Chinese).