I think what some consider dishonest is booking a resort reservation specifically to get the 180+10 booking advantage for restaurants, and then cancelling the resort reservation, while intending all along to stay offsite. Yes, I've heard of people doing this.
We're not sure what to do about that on the boards as there is no rule that says you can't do this. It's kind of a pain to have a deposit all tied up and then having to call to do the cancellation, and I wouldn't think just 180+ 10 is worth it or even all that necessary, but I can't underestmate the urge for some planners to make every reservation ASAP. Personally I'd guess it doesn't happen often enough for anyone to care about.
To answer the essential question, cancelling a resort reservation will NOT affect your restaurant reservations. If you're intending to cancel the trip entirely, or move it to a different date, you have to make sure you cancel your restaurant reservations separately.