It's not a media OS. You're thinking something like XMBC... Jellyfin is more equivalent to a streaming app - but the backend is running in your private server

It's not a media OS. You're thinking something like XMBC... Jellyfin is more equivalent to a streaming app - but the backend is running in your private server. Clients are available for the vast majority of consumer TV oses (Roku/Apple/AndroidTV/Web/Etc)