I tuck and wipe instinctively, because I don't like the taste of soap, not because I'm worried I'll cut my lips.
There is plenty of time to become a mouth - breather..... preferably in the old folks home. For me, that day gets closer all the time!LOL. I've seen this topic before somewhere. I don't clear my lips. I just keep my mouth closed while I'm shaving. Frankly, I try to keep my mouth closed most of the time. I'm even more focused on that as I get older because I've seen too many older men walking around with the mouth wide open for no reason other than they probably don't know it's open. I don't want to be that guy..........ever. So, I don't clear the soap from my lips. It doesn't bother me since some will invariably get on my lips while lathering so leaving it there until I rinse off that pass isn't going to kill me.