Just the opposite here.
I used a snorkel in the pool, but when I went to my OW1 check out dive, the DM told me to take it off and put it away. I have never thought about putting it on again except when required. I keep it in my dive bag, because some places will REALLY give you a hard time about it (you can see it in my avitar). I also use it for snorkeling when on vacation the day before we fly.
Man, I need to update my avitar, that photo is really old and I don't even have/use most of that gear any longer.