It used to ask you after "a number of" individual dismisses if you want to continue receiving recommendations but I am currently dismissing most recommendations but it hasn't asked me. I had an issue that set back my running quite a bit and I'm not ready to do threshold/sprints etc...
Not sure if they removed that or not, but my watch hasn't asked me the last few months of dismissing.
This is great news and just absolutely amazing what NASA has achieved here. Keep going Voyager(s)!!!