I downloaded it on both my Roku and Fire ( Amazon ) devices just as easily as any other app.

Of course, the applications use the native remotes for these platforms. Since I am the one that puts all the content on Jellyfin, my less technical wife sees it like any other channel ( like Netflix, Disney, or Prime ).

I do not use AppleTV anymore but I installed it on my iPhone as well. I had used Plex before. I did not a find Jellyfin any harder.