akshaykapoor wrote: "...when this shortcut runs, it locks the screen but doesn't turn it off, and hence the screen instantly gets unlocked by face-id."
For me, if I wait a few seconds just looking at the Lock Screen, the screen turns off and the device is locked. This is what I expected it would do and I wonder why yours doesn't do the same.
Only if, instead of waiting, I swipe up from the bottom will Face ID be activated.
"Trying to understand the use case for this new shortcut."
I've added this new "Lock the screen" action to the end of my "Going Out" custom shortcut which turns off Wi-Fi, etc. before I leave home. It gives me the opportunity to check that the correct wallpaper containing my contact email will be displayed in case I lose the device. (My "Going Out" shortcut uses the Set Focus action to switch the Lock Screen wallpaper.)
Ref: Shortcuts User Guide for iPhone and iPad
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