Look, you can try to calibrate your way up but it does have basic "issues" and since you can find priors I'll see if I can find some Rtings cal link and stop.
I recently bought a 43 inch TCL S405. When I connected my ps4 (not ps4 pro) to it and turned on HDR, the picture seems washed out and dull. It is far more vibrant with HDR off. What could be the cause of this? Has anybody had this problem? If so what are the HDR settings you use to achieve vibrant colour with HDR enabled?
Also, there is no vibrant colors with HDR on many of the cheap HDR sets. You may encounter folk that disbelieve that but they get to live with it. The fix remains to turn off HDR for better results.
About moving the goal posts. Gaming settings would be to me, HDR off and if the set has it, Game Mode on.
For the record, I don't believe the TV is the problem, and I don't know how you came to that conclusion. From what I have seen, HDR content on the inbuilt YouTube app looks very good, so I suspect the problem is the feed the PS4 sends to the tv once you change ps4 settings to HDR. Notwithstanding that though, a vivid HDR mode would be nice. Hopefully TCL includes one in an update. For the time being u can simply calibrate HDR settings for a more vivid look.