Well you might be right, a 31khz crt doesnt really ruin the experience as much as a lcd does, but i believe, at least for me, as i grew up playing nes, snes and genesis on 80’s 90’s consumer crts, and have had all those great memories printed in my brain, me and my older brothers playing mk, dk, mario, streets of rage, double dragon and many great games… Here comes nostalgia, all i want is to replicate those good old times , even on the crt tv im using atm, games don’t really look how i remember them but at least close, in my memory those old tvs had a lot of bloom, soft picture, and games looked like hand drawn and smooth. This is where a 31khz doesn’t seem like an option, i know its a true 240p, but those scanlines don’t look good on games like dk and killer instinct. The 31khz option might be good for a new comer who never got the chance to witness 240p on a consumer crt , its still a lot better than a flat panel.
In the end, each has a different taste, and there is no definitive best way, personally i liked nes and atari games better on the 31khz crt. And nostalgia is a huge factor too, i would play on the real consoles if i had every game i wanted to play. On emulators i try to avoid that urge to use save states to get through difficult levels, in some games like rtype series, no way to beat these games with the given 3 or so lives unless one has mastered all levels to a certain degree and that would consume a lot of time which is not available at my age, also the idea of having an endless games list on queue, i can’t help but rush through all of them .