That's been my experience too.

Plex came with my nas, and we never used it because it it was really fiddly and wanted to show everything except my content.

By contrast, my jellyfin is linked up with the jellyfin for android tv app on the big screen tv, and if nobody told you it wasn't a regular streaming service you'd probably never know because it's so straightforward. My wife is not techy at all -- she still daily drives her Android phone from 7 years ago because she doesn't want to change to her new one from 2 years ago -- but she can pick up the remote and play a movie at any time.

I use it every night on my phone to play videos that help me get to sleep, and the app works well.