Is it common use? Locking the computer but staying at the desk, why?
In any case you'd just lock it the same way you do now, I tried locking my MacBook Pro just now and it shut off the screen almost immediately so it wouldn't unlock unless you woke the computer, which BTW isn't too dissimilar from the Apple Watch feature which unlocks the MacBook simply by being near it.
If I am in a meeting and I am talking to someone, I will lock it to keep their eyes on me when I am talking and not on my screen. I can use the touch id sensor to wake and log in in one push. I don’t have to intentionally look at the screen to make it open.
So if you like something "a lot of people" do it but if you are skeptical it's suddenly a useless feature. Figures.
A few vocal sub-minority believe FaceID is the solution to their problems including their laptop. It’s nothing more than a gimmick in the laptop world. Can you identify what is the problem here, and what is FaceID solving on a laptop? Why do you think MBP users need it?
I’m simply presenting the counter argument for why I disagree.