Has the Jellyfin app improved for Roku in recent years? Last I tried it, maybe 2 years ago, it was near unusable from a UI perspective

While I think most agree with you, it’s important to note there is more to networking than WAN access. Streaming 4k in your home network over WiFi sounds pretty awesome for security cameras and other self-hosted medias.

I would say, more than likely no. That being said, just try it and see. More than likely it’ll become apparent what is and isn’t usable (I’d guess the octoprint interface would become unbearable to navigate if you’re watching something at the same time).

You might also run into hangups on octoprint’s end, potentially halting prints, though I feel like that should be avoidable (I know I’ve had prints halt when my pi was undervolted)

The first thing that springs to mind is something like a “magic mirror”. I haven’t delved into it a ton, but I’m fairly certain that it would be able to hit most of your criteria.

That being said, I’d think it could be a decent enough starting point to at least find other things in the same vein.

Can you expand on some of this?

I haven’t really heard much regarding them being bad to their community/customer base, though I haven’t bought in a few years.

In regards to cost/performance, what are you meaning you’d need to spend extra on to match that of an old laptop or recycled machine?