In my own experience. It is about skills. But if you don't have the skills you need more methods and process. The less skilled is your team, the more processes you need.

I think that's going down the wrong path: you can get "pretty good" software if you get the best people and just let them work on it. But it'll still have bugs. You need more process and stuff like verifiable software and all that kind of overhead to really start getting close to bug free.

Well that's part of it. You need to have the experience to know which methods and processes give you the most value and quality for the time invested. There's many skill sets involved and knowing good processes is just one.