I can only pray to Omnissiah that Rogue Trader doesn't need a year of patches to be playable without excessive frustration.
Why wouldn't it? Rogue Trader Beta was way worse than WOTR's before release, and WOTR released with good 25% of everything not working as intended, + seems like Rogue Trader in general had less development time.
If anything, Rogue Trader will be even more unplayable than WOTR. The fact that it also comes to PS5, while owlcat can't fix the WOTR PS4 version, and never bothered releasing a PS5 version, is even more concerning.
So no need to pray, just wait for release and wait for actual player feedback.
P.S. it is pathetic that we are worried about things we never thought about 10-15 years ago. We aren't discussing if games will be good or not, we are talking about how much time after release those games will be playable without frustration... It's impossible to buy a 100% working game on release nowadays.