I'm anti-capital letters - not in the sense that you shouldn't use them.
But in the sense that they add very little to our current writing system.
We don't have 26 letters in the English alphabet - we have 52, because many capital letters are completely different symbols to their lowercase counterparts:
a → A d → D g → G
So we have to learn twice as many symbols, just for names and the first letter of a sentence? Frustrating!
this is especially frustrating when you realise we only need around 44 letters to represent english phonetically, so we're learning even more glyphs than we would need to if we switched to a phonetic system!