Well, they are known for having bad PR... Doesn't surprise me, and I knew what I was signing for, in fact I've never even read Steam disclaimers, didn't need to...
Thing is, legally speaking, the OP is correct, no matter how Try-Hard White-Knighting you people do, it's false advertisement. There are no "subjective" interpretations of that, it's in fact unstable, for some more than others, but doesn't matter. Also the bugs are not in any way shape of form "obscure", they are in fact core gameplay issues, one of those being the missing perk functionalities, that's not obscure, it's quite blatant, talking about those perks I still can't get my head around as to why they've not fixed those yet, but then again, no matter.
So to sum up what I think, I'd say TW is in the wrong on this, that the game is actually playable (but unstable and really bugged), on the other hand those disclaimers exclude the "Beta" strain, if you are playing 1.3 beta, for instance, you are under a different disclaimer spectrum, and cannot, by any means, demand a refund... If that's the case, it's your own damn stupidity (OP). If not, if you're playing the main one, then you are correct to demand a refund, though I know you won't. So, TW has a nightmarish PR, proven time and time again since 2015, they also lie a lot in their own announcements, again really old news, been like that for almost a decade, that's why I find the whole try-hard white-knighting quite irritating, just stop that, let the guy complain, he's in his own right, and if we disagree we simply have to not ask for a refund, surprising? Shouldn't be...