It was significantly harder to set up remote access for Jellyfin than Plex 6 months ago. I ha ent attempted since. With Plex there was literally no set up, it just works. Until it just works without having to do any extra work, Jellyfin will struggle with adoption.

I have both running, and thatd a big difference to me. Also I prefer the way Plex detects intros and credits for skipping and their detection for captions. Once that’s all sorted Jellyfin wins in every field.

I do this too but it only works on my home network not remotely.

With the caviat that you have tailscale enabled on both devices. This prevents it from being used on a roku outside your home but you could access it remotely from your computer/phone/tablet.

It is significantly harder than Plex, currently. There are improvements happening all the time though.