What would IPFS solve that is still a problem today? The only disadvantage of bittorrent is that it doesn't handle mutable content, but 1) videos never change and 2) any mutation of content implies a fixed identity, and that is what Peertube is here for.

The biggest problem to solve is diacoverability, a thin shell is not enough if you want to solve the general problem

Isn't that more or less the idea behind LBRY?

nope lbry uses their own custom torrent-like protocol on top of their own fork of bitcoin with their own weird python lbry daemon which communicates with a javascript frontend which is pretty much completely centralized in the browser version. Even the desktop version relies on centralized features like comments system.

Yeah I think so. Instinctively I do believe that this would be the most natural development. However I thought that federated social networks where kind of cool so maybe this is a better idea.

I do believe I tried to sign up for LBRY but I don't know if it really took up.

Might it be that LBRY simply doesn't scale or that there is some network effect that causes it not to work unless there are some specific conditions.