At this point HDMI is not a particularly new thing; my Marantz receiver from ~2007 had HDMI connections on it. Audio-only digital connections aren't necessarily going the way of the dodo yet, but they're becoming progressively more niche. So are home theater PCs, of course.
Anecdotally: I do have a Mac mini with my receiver, which I replaced this year. But the new receiver not only has USB input, it has wifi and built-in clients for Spotify, Tidal, Pandora, TuneIn, Roon, whatever protocol Windows uses for media sharing whose name I'm utterly blanking on right now, and a dozen or so other services, with Apple Airplay 2 theoretically coming in an update.
Anecdotally: I do have a Mac mini with my receiver, which I replaced this year. But the new receiver not only has USB input, it has wifi and built-in clients for Spotify, Tidal, Pandora, TuneIn, Roon, whatever protocol Windows uses for media sharing whose name I'm utterly blanking on right now, and a dozen or so other services, with Apple Airplay 2 theoretically coming in an update.