My whole family uses Plex, they can operate it incredibly simply with a remote and don’t have to unplug and replug a thing. The simplicity is key, if you’re only catering for yourself/an exclusively techie audience then it’s not necessary.

Ignoring physical appearances, it presents large libraries nicely and allows you to use your phone or remote instead of needing to fiddle with a laptop.

A few other nice features: can stream different content to multiple devices, users can be given access to specific libraries, and content can be age gated.

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)