Camp 2.
I shoot my carry FS 9mm almost every time I shoot. I use it in training courses.
For every round fired I have hundreds of dry practice draws, pointing in's, trigger pulls, slide manipulations, clearance drills, and practice reloads. I check carefully to see if I am actually wearing parts out and fix/replace anything as necessary. I know my gun well.
I have a second FS 9mm set up the same way, and I use it for both dry practice and actual shooting. It can be rotated to primary at any time.
I have had new guns break right away. I have had trustworthy guns with low round counts suddenly break. IMO, not shooting a gun does not guarantee it will not malfunction at any particular time. Sure, odds are a good quality gun with a low round count has a reduced chance of breaking, but that's no guarantee.
I understand the concept of not shooting a carry gun much. I also understand there is a continuum of commitment to EDC. Some people who carry just don't shoot much. Others (like me) shoot a lot. No judgment here.
In the end, I doubt there are any statistics that prove one approach is more successful than another. I enjoy and teach all kinds of shooting, but personally I focus on my EDC skills above others. Shooting the same gun often seems to be no disadvantage to me.