CRTs have better motion clarity than any "flat display" because of the way it refreshes the image (electron beam). Certain things just look objectively better on a CRT (mostly retro games but also some TV shows if they were released with an interlaced format).
I know well those CRT displays, I repaired enough decades ago. The phosphorescent layer make the image softer, but the quick movements often looks "washed" because this.
Telling a CRT user to switch to a current HD display is like telling someone who plays Doom to upgrade from Win95 to Win11 because Win95 is "outdated" when Windows 11 doesn't even have a DOS mode anymore. Certain things were meant to be used in a certain way.
I have no problem with people who like the CRT displays. And usually isn't a problem to connect a CRT to an old video source (like Doom with Win 95). When you want to connect a CRT to a "new" video source, it's another story. Needs "things" to be able to connect (like that vga666 project - GPIO pins with 6 bit resistive DAC to get some kind of analog RGB), resolution incompatibilities. Usually workaround exists, sometimes good, sometimes barely working...