That’s true to a certain, significant, extent, but I think you’re overstating it a bit, you can get a bunch of unlucky rolls in a row in both DD and BB, that wreck you, when the situation wasn’t really avoidable in the first place - i.e. you were just doing a normal match with sensible tactics in BB, or you were going into a dungeon you’re required to go into by your level and so on in DD. The only way to “win” in the sense of never being the victim of RNG is not to play.
Being annoyed by the RNG isn’t a matter of being probability blind, it’s a matter of cursing the winds of fate, which is pointless, sure, but perfectly natural. DD is better built, certainly in Radiant, in that you can recover, you can back to where you were, and next time you’re in the same situation, you can hope that RNG will be less mean, and probability dictates it will likely be less mean.
You can minimize chance, minimize the number of rolls you make at all, that helps a lot, but most of these games hard-force you to throw the dice. A lot.
There is that, but there’s also the feeling that people have from non-chance-based or less-RNG-y games that you use the right tactics, you “should” win. This isn’t people being bad or not wanting a challenge, I think it’s a bit smug to suggest it’s that simple, it’s just having expectations which don’t match up with certain games. Many of those expectations are built up by years of gaming, too. Someone coming from something relatively deterministic, like, say, some versions of Civ, to Blood Bowl, where it’s all about understanding risk and knowing when and how to roll the dice, is understandably going to be confused, because superficially they have a lot of similarities.
I think a lot of these games could be helped if their tutorials showed up a bit of the results of risk, made it clear that, whilst you can and should be minimizing risk, you ARE absolutely going to be the victim of RNG, it’s just a matter of when. Doesn’t help, with DD, for example, the Reynard and Dismas usually live quite a long time, and then when one of them does cop it, often in a way which wasn’t avoidable, and would barely have made someone twitch if it was just Highwayman #2122, they get mad because it was Dismas.
Doesn’t help BB either that it doesn’t have good recovery mechanisms and encourages you to personalize your team! Who then may be horribly mangled in short order (or go on to be the greatest BB heroes who ever lived). A lot of that depends on matchups and what other players or the AI decide to do. Also knowing when to just try and keep your poor bastards alive and fuck winning (doesn’t necessarily work if the other player has decided to murder your dudes - you may well win in that case but with half your team crippled or dead…).