They have on some (IIRC some of the bodyguard series perhaps). It doesn't keep me from one. Give me a screwdriver and I can remove the lock in about 10-15 minutes tops. I have 3 with locks. My 329pd is the only one I have bothered to render lock-less as I blamed the lock on the gun tying up, especially after reading a bunch on the internet regarding lock failures on light, hard kickers like the 329. Guess what? It wasn't the lock! My guess is the lock gets blamed for more trouble than it actually causes. In any event, it is very easy to remove and you can even get a 'plug' if the open hole bothers you.
If I had a choice I would obviously prefer no lock, but it doesn't scare me off.
The fact that they did it was enough to keep me from buying one
