I've never in my life left my car without locking it.. Never will unless I forget and that might never happen cause Im programmed..
I almost never lock my truck unless I
have the GPS unit in it, or I'm in a bad place, or parking for many hours.
If there was valuable shit in the truck, I'd lock it.
Nothing much in there, no need to lock it, IMO.
I'll leave the keys in it ( door panel), in front of my condo ( sort of almost senior housing), but not anywhere else.
I'm of the theory...don't break my window, the door is open, nothing much here to rip off....