in this last update it actually popped up after the update and told me to change some settings, so if you have done a settings backup and it's taken across your 1080p settings it will identify you are actually connected to a 4k TV and sort itself out.
Ultimately I think that some of the issues highlighted here are down to HDR as a feature and as a format is a total mess.
You've got people wondering why their image looks weird when the TV manufacturer has said it supports HDR (but actually doesn't meet any of the poorly enforced standards)
You've then got other people such as the user here, who has bought UHD disc for the 4K image, but the format also includes HDR by default, which your 4K TV may not support at all.
The strange this is that it'll be nice to be up and running straight but I am sort of going to miss all that messing around with settings with a new console. I know it's not a true new generation of consoles but there is always about new stuff, as long is it does all work properly when you are setting it up yourself.
I had no intention of upgrading to a 4K/HDR for two or three years for the exact reasons that you mention and also because a new TV is pretty much a long term investment and I thought the advantages of waiting that length of time would make a far better return for the money I spent than waiting the amount of time when I upgraded to 1080p.
the only reason I have a 4K/HDR is because my friend was selling his 50" Sony XE70/X70E (USA) for £200 as he was upgrading to a really good set and £200 makes it a much shorter term investment for me even though it's nowhere near a top end panel.
It would almost have been stupid not to have paid £200 for it but it's a clear upgrade over my previous 40" bedroom TV and it rates pretty well on
rtings.com as a set and I can still upgrade 2 or 3 years down exactly as I planned to without really losing out.
It's been fan absolute game changer on the Pro and I wouldn't even be considering a Xbox One X let alone ordering one if I didn't get that screen at that price simply because our Xbox doesn't get used that much but I do want to play the games that I do enjoy at 4K in HDR and I get a UHD player included. I would have happily gone for the Xbox One S UHD player but that obviously doesn't support 4K gaming.
I have saved a lot of money on a TV with an RRP of £700 (I know you can get it cheaper than that) but I've obviously spent what I've saved to buy the X.