throwme1234

My impression is that most teams have high enough natural attrition that it doesn't really matter and some teams even seem completely immune to any sort of real change, even if they do extremely poorly on their deliverables. I know a few teams that other teams actively avoid working with, even preferring to reinvent some of their solutions, yet, more or less the same people have been working on these underperforming teams for several years.

You can still have bad hires. It happens rarely that the bar raising process outright fails, but it still happens, since the data you get out of an interview is very limited. For example, we had a team member that not only was doing a bad job on his own stuff, he was a drain on morale and resources for the whole team, since he constantly complained about everything, he never tried to learn anything, he posted big commit dumps every few months - hundreds of commits at once - and the code quality on those was abysmal. Luckily we got rid of him pretty fast, but not fast enough.