All-lowercase comes accross as the text equivalent of a hoodie and jeans: comfortable, a bit defensive against being seen as trying too hard, and now so common it barely reads as rebellion.
By extension you can see how that could also apply to tech.
You're almost a century off :) https://www.bauhaus-bookshelf.org/bauhaus_writing_in_small_l...
There is massively different subtext between the two. Autocapitalization and autocorrect represents a limit on the subtextual bandwidth you can communicate along with a message. Restrictions on subtextual bandwith are not ideal when your generation relies on text-based communication for evermore intimate interactions - that "whats up" message might be the start of you asking someone out on a date, I don't want it formatted the same way as a message I would send my boss.
In German even ordinary nouns are capitalized, making it even less easy to find the capital at the start of a sentence.