But they don't "fundamentally" look different, it's font dependent(there are fonts where they look the same), just like the same Latin k will look different depending on a font, so you need a better rule to make your own simple Unicode
He's probably the guy who decided to add fraktur/double-strike/sans-serif/small-caps/bold/script/etc variants of Latin letters to the Unicode because, you know, they look different! so they should get their own special code points.
What about Cyrillic T: Т? It looks the same uppercase (but not lowercase. And in italic/cursive, which I believe is not encoded in Unicode, it looks sort of like an m).
When I look at your post, in "K", the lower diagonal line branches off of the upper diagonal line, slightly breaking horizonal symmetry, but "К" is horizontally symmetrical.
