KDE connect is such an under appreciated killer app it's not even funny.
When I go to house sit for a friend I just hook my laptop to their HDMI, pull out KDE Connect, and bam I'm kicking back 10 feet away watching my streaming stuff on my system with adblock running and everything, and the media controls just work.
I'm strongly considering using a Pi 3b+ as a TV machine where KDE Connect is the primary interface. It just works so well.
I also love getting text alerts or low battery notifications on my desktop without having to keep looking at my phone. It's just amazing.