Because the point of unicode is to accurately depict every sort of writing regardless of format, not to make a neat table of every unique glyph. Fonts may want to render the two differently or treat them differently. Same reason why there’s a difference between an em dash and a quotation line mark

Same reason why unicode is full of random characters that only ever appear like thrice in some Russian coptic manuscript from the 3rd century - it’s about being able to depict something, not perceived usefulness

Also excuse my ignorance, but who’s Uriel? Because right now I just have the mental image of a very upset archangel which I’m guessing is not what you’re referring to. I mean it could be - I’m pretty sure unicode would fall under his domain of literature

Also idk about the newer ones but the old ones last forever. You might need to change their battery but that’s not too hard. I got a kindle keyboard that’s been going strong for over a decade now.

Also kindles work fine with calibre, you just need a different file format. Mine can read PDFs! (I do not reccomend reading PDF scans on a kindle)