I actually don’t use Plex but Infuse, but OP is not in iOS so I went with that recommendation. You can also build your own “seedbox” if you are willing to have a server running 24/7 and have an ok internet. That’s my setup.
For me the benefit is 4K remuxes from top tier release groups (like Framestor) . If you can get there with your setup, I don’t really see a drawback.