[mcguire]

In my experience, good programmers can produce working software with or without any processes. Poor programmers cannot produce working software with even the most perfect, appropriate processes.

All of those practices can help, if used appropriately. But they're not going to magically make everything better.

[Bartweiss]

Yep. There was good code before CI and source control, and there's bad code even where those things are in use. Certainly they're tools worth having, but checklisting tools doesn't actually say much about software quality.