Unicode was mostly OK when it wanted to encode multi languages. It started to get a mess when thought it needed to do more.

Yeah the multi-unicode-char grapheme clusters are basically only for emojis once they started adding stuff like every ethnicity/gender combo of 4-person family. And that one historical Korean script.

What do you think doesn't belong in Unicode? It turns out that expressing all the different ways humans have used text in history has some necessary complexity, but assigning each character and modifier a number seems like a perfectly reasonable approach.