Well, that IS the entire point of any smart watch, that and the fitness sensors. Looking at your wrist for 2 seconds is a lot more convenient than pulling out your phone, unlocking it, using it, locking it, putting it back, plus it saves on phone battery life. But also, everything before the guy leaves the house isn't just saving on "taking my phone out", it's doing things in the shower, or at breakfast, when he doesn't have the phone on him at all.
Apparently you missed the fact that the watch is water resistant, able to be submerged up to one meter for up to 30 minutes, and Apple specifically says you can use it in the shower or the rain.