OP is correct. Resolution is relative to distance, so beyond a certain distance, your eyes can't discern the difference between a 1080 and 4k TV. Hell, if you stand far back enough you can't tell the difference between a 4k TV and a 480i CRT. This is regarding just the display. When you bring the resolution of the source material into play, things change. Ideally, to get the most out of a display, the incoming signal should be of higher quality than your display. Meaning, if you had 2 1080p displays, but one was showing a movie in 1080p and the other TV was fed the same movie, but in 4k, the TV with the 4k feed will look slightly better. TVs have always done a better job down-rezing the incoming signal than upscaling it, So I always laugh at dudes with 8k TVs watching primarily 4k content.
This new CRT craze is stupid. CRTs were good, but not great. I use to own a 36" widescreen HD CRT. It was awesome, but when I replaced it with a Samsung D series 7000 Plasma, I never looked back. CRT was no longer king once Pioneer Elite released its first 72hz Plasma.
I'm an old-head who worked over 10 years selling ultra high-end A/V (Krell, McIntosh, B&W, Wilson, Faroudja, Runco, etc). I was also ISF certified around 2003 and use to calibrate TVs as a side hustle.
CRT is best for retro gaming visually and latency wise. Genesis, Ps1/PS2, NES etc look and perform accurately on CRT.