Replace External Satellite Receiver with Internal TV Tuner?

I have your exact setup except replace the Roku with a Shield and Zgemma with VU+

I have an LG CX , and it wont cut it on its own as a receiver , far too fiddly to change between freesat and saorview , you can set up favourites but they get wiped after every update ( quite frequently ) and you must choose a country on setup , so to get the freesat epg it must be UK , in which case saorview is all over the place , or you choose ireland , then no freesat epg and sat channels are all over the place.

UK catchup apps are geoblocked and dont work here without some legally questionable shenanigans.

Plex apps depend on access to the hardware in the client , and in the case of an LG TV it doesnt have it , so long story short , the Roku or in my case the shield , is a better client for plex than the TV is.

LG TV's are good , but you still need your boxes.

Whatever about the apps, my tv has Saorview and satellite, I record on the tv and it is handy to have the combo box when recordings and viewing clash, so even if you dont use the box for day to day viewing its handy for a backup.

For Ireland there are no TVs without those limitations.

The performance of Plex apps varies by device , it is not a software player and relies on the hardware of its client device.

It does not have full access to the hardware of the LG TV so will stall and stutter and flat out refuse to play some material. It will often post a message saying " unable to transcode " etc. Basically its utterly useless.

Plex on the shield or Roku has full hardware acceleration and therefore plays everything no problem.

From your first post , what you already have is about as good as it gets.

I've never had an issue with favorites being wiped after updates. Straight forward once setup press and hold 1 gives me Saorview press and hold 2 gives Freesat.

Yea Saorview tunes out of order but can then be rearranged in whatever order you like.

The existing Roku should cover any missing Apps.