TL;DR http, properly implemented, supports a ton more stuff than even many “web developers” are aware of, like… range requests, which are exactly what you’d think they’d be.
They like real buttons, lacking flat nonsense, and densely-presented functionality. I do too, so I get the impulse to resist calls for change, but agree with you that a light-touch reorganization of some of the buttons & menus, and some filing-off of wholly-unhelpful behavioral rough edges would go a long way. It’s one of those pieces of software I’m constantly nervous using, because I’ve seen it do weird, destructive things for no other reason than some piece of the UI is “quirky”.