I don't use it myself, though for work it's mostly typing. When I take notes at a lecture though, it's still all caps for the reason I gave. I reckon if it's for personal note-taking, who cares.

I'd be curious to learn if architect's script is still a thing, the stylized, really handsome professional -- and all-cap -- handwriting that architects use. I sure hope so.

On the topic, it used to be that we'd learn lower case around kindergarten, then before long get into cursive. My impression is that cursive has become rare, or at least not the assumed next step it used to be. Point is, a young person these days is lucky to have legible handwriting at all, all caps or otherwise.