Most modern displays are calibrated, to some reasonable level, and can easily accommodate the very limited gamut of an old CRT, especially anything supporting HDR10. I suspect this is more of "they need to be fudged so they're wrong" more than anything.
I don't think old CRT gramut is "very limited". Only plasma screens were as good.
Plasma has great contrast and a slightly wider gamut than a CRT. Neither one have particularly good gamuts unless you're comparing to sRGB. Many current screens can do much better.