1. I can choose any resolution without blurring... problem now worse with 4k screens (lots of angry posts in Stellaris forums due to UI that is hard to read in 4k and become blurry if you lower the resolution...)
2. Ridiculous response speed... playing Crypt of the Necrodancer or Super Hexagon is much, much more fun on CRT, all mistakes feel like it was purely lack of skill, instead of feeling something unfair happened. Ditto for fps... CS community in fact is hogging all CRT, the ones I knew for sale all ended in some CS player home willing to fudge settings to end with crazy refresh rate and response speed (there is even a video of a guy pulling 200+ fps by using interlaced mode!)
3. Better blacks and whites... in fact, this was the main reason, when CRTs died I also abandoned them, but all screens I had after had colour or contrast problems, I had to fiddle with settings constantly, one day my screen broke and a CRT was available nearby, when I plugged it in, I was blown away by the image quality that required only geometry settings, no endless messing with gamma, colour profiles and whatnot.
4. Not valid anymore, but until recently CRTs were much cheaper than flat panels of equivalent quality, at least on my country... but now with "new" stocks empty, used prices around rising, I even own a CRT tv that now on eBay costs more than the price it has when it was new... (this particular model is also the one used as reference for some SNES emulators CRT "filters")