To whom it might interest:
I now am using an LG 50" 4K TV as my main monitor, together with a second 22" FullHD monitor for more than 2 months.
The experience has been great and I am actually sad, I did not go this route much sooner.
The external 22" monitor is used for Outlook and for remote calls where I need to share my screen. You do not want to share a 4K resolution screen, as the other parties won't be able to read anything on their FulHD (or less) screens.
The other oddities or less good things:
1) The TV does not have a standby mode as we know it from computer monitors, that switch to standby in the absence of a signal. The TV will instead switch to a default screen, complaining there is no signal. It means that I have to switch off the TV when going for lunch or at the end of the day.
2) The TV will notify me every 4h that it will switch off unless a key on the remote is pressed. This is a bit annoying, but on the other hand, it alerts me that I have been sitting for 4h straight and it is time to do a break.
3) The HDR does not work 100% and I think it is a Windows 11 problem. Sometimes, depending if I open i.e. Chrome, the screen will change brightness and colour space. A bit annoying but not that big of a deal. You get used to it.
4) Some applications insist in starting in full screen mode and you need to minimize them/size them according to needs.
The great about using this TV as the main screen:
1) It is literally as if you had 4x 24" FullHD monitors without the frame in the middle. You get so much desktop space, that you never again need to minimize applications. They all fit!
2) Initially I was worried with having 4 apps each in its corner running in FullHD and how much of a deal it was to get them all in their position. After some days, I naturally stopped worrying about that! I just put the window where I need it with the exact size I need it. There is enough space for everything to fit.
3) Some few applications really benefit from running maximized: I develop manuals in Word and being able to see up to 8 readable pages is amazing. The same for huge Excel sheets.
4) I do work (hobby level mainly) with TV related applications and of course it is great to be able to see a 4K video stream in all its glory.
5) I have not played games so much, but the few I tried are much more immersive if you are sitting at about 1m from a 50" screen.
Some further notes:
My previous graphics card did not have enough memory to benefit from 4K resolution for games. You need a good graphics card to really benefit from the screen. I am using a RTX4070TI.
With 60Hz, the screen refresh rate is perfectly OK for me, perhaps gamers or special application require more than that and in that case, t he screen would not be suitable.
The colours are OK in HDR mode, including red text or text on red background. That was a bit of an issue without HDR active.
Finally:
Sitting in front such a big screen and so close to it (1m), does cause some strain on your eyes. I use the screen always in might mode (reduces blue light) and even so, I notice some strain after long sessions. But: on my previous setup (which I still have next to me), with 2x FullHD + 1x 1280x1024 screen, had the problem that it was becoming difficult to read the screen.
The same goes with my laptop with a second external screen: To read the laptop screen I need to remove the glasses (too close - I am short sighted and with age I no longer can see at short distance through the glasses), but then I cannot read the external screen (too far away). With the 50" TV I can always see everything with glasses.
The other option would be getting progressive glasses, but those just average the problem: you won't see great neither in short nor long distance, plus I would require much bigger and heavier lenses.
When selecting the screen, consider dpi: do not buy a 4K screen with 32": everything will be too small and with windows scaling you enter a whole new world of problems. Consider the ideal FullHD screen size (i.e. 24") and multiply into a 2x2 grid and you reach a 48" screen. Do measure your desk! In store the TV's seem smaller than they really are. I wanted to buy a 55" screen initially, for bigger text size, but such a TV would not fit!
Regards,
Vitor