RSS is not dead, it is still supported by everything on the web except the large social networks that have corporate interests in not supporting it. This is in large part because all the content management systems support it.
[1]: See for yourself: https://clbin.com/B0v1yt.png.
That being said I'm sure it is very usable in a utilitarian sense.
I agree that overall, usability is still a huge problem for rss.
But the core feature for a video player is that it plays the damn video. That's core UX, and most other players of the last 15 years have dropped plenty balls there. You can have so many skins and library features and preview screenshots but if the movie doesn't play without your nerd cousin first breaking your OS with sleazy half-broken codec packs, the UX is shit.
The most difficult part for non-tech people using VLC is understanding Finder or Explorer to double-click the movie they just torrented.