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