The main thing is that static analysis tools, strict code style and whatnot put both a cap and a ceiling on the code quality. It will be a bit harder to write complete garbage, but at the same time, it has a negative impact on code quality because many of those rules are completely nonsensical and decrease code readability. Also, it puts a severe limitation on expressivity, which is a negative thing if you want your programmers to actually enjoy their job (which increases productivity...)

Of course, if all you care about is the fungibility of your programmers, then having those overly strict rules completely makes sense, but if you want to produce a quality product, not so much.