My biggest gripe here is that we will need to kill UTF-16 so we can have a larger set of codepoints, and that's only a gripe because killing UTF-16 is going to be really difficult, not because I want to keep UTF-16 (oh no, UTF-16 really needs to die).
Coming your way in Unicode 16.0...
Allow me to introduce: BOTTOM LEFT JUSTIFIED UPPER RIGHT QUARTER BLACK CIRCLE!
https://www.unicode.org/charts/PDF/Unicode-16.0/U160-1FB00.p...
But wait! There's more! U+1CC31, UPPER CENTRE LEFT TWELFTH CIRCLE! And you best believe there's 11 more.
https://www.unicode.org/charts/PDF/Unicode-16.0/U160-1CC00.p...
I, for one, would love to see a UI that is composed entirely of typographic symbology, even to the point that it would function beyond the normal UI paradigms. I'm a huge fan of things like FF Chartwell, where the font contains super rich, detailed information that is not just a 'letter' or 'character' .. See https://news.ycombinator.com/item?id=41365761 if you don't know what FF Chartwell is yet, maybe you'll enjoy it, maybe not ..