See also this thread with Noel De Martin, discussing a (Solid-based) organizer for your media library/watchlist: https://noeldemartin.social/@noeldemartin/105646436548899306
It shouldn't require Solid-level powers to run this. A design based upon "inert" data like RSS/Atom/JSON feeds (that don't require a smart backend to take on the role of an active participant in the protocol) would beat every attempt at Solid, ActivityPub, etc. that has been tried so far. "Inert"/"dead" media that works by just dumping some content on a Web-reachable endpoint somewhere, including a static site, is always going to be more accessible/approachable than something that requires either a server plug-in or a whole new backend to handle.
The litmus test for any new proposal for a social protocol should be, "If I can't join the conversation by thumping on my SSG to get it to produce the right kind of output—the way that it's possible with RSS/Atom—then the design is fundamentally flawed and needs to be fixed."