There’s a switch in settings to enable sponsorblock, and if I remember correctly that includes DeArrow. Was really happy to discover that back when I did, both of these turn YouTube into such a different, better place.

DeArrow is on freetube though?

I’m too lazy to comment on all the other stuff, but you can get your bog-standard 2.0 stereo from any encoded track. Strikes me as kind of funny to argument with future vs. past and then stick to 1930s stereo tech for film when it’s become more easy than ever to set up a decent 5.1 system.