I almost always shoot DA revolvers in the DA mode.
That being said, I want to have SA available if I want to use it. No matter if I never use it, I want it available if I do.
I shoot my revolvers for sport as well as carry them; including my belly guns. I occasionally fire them in the single action mode if available. I really don't want to give that option up. I have a 442 and it is a fine revolver. I like the action on it and if I need more precision, the action allows for repeatable staging. However, not that this has anything to do with the topic at hand but........ my 442 shoots way high and to the left, so it is a safe queen. I not only want DA and SA, but I want POI = to POA.
My old and much used Model 60 gives me both.