If they're doing up to 50 commits a day and deploy all commits to master automatically how does that line up with "It makes it much easier to identify bad commits. Instead of having to dig through tens or hundreds of commits to find the cause of a new error, the pool is narrowed down to one, or at most two or three"?

If you do a commit and find out in the middle of the day the latest deploy is having problems and people are still committing in new code wouldn't this make things much harder to narrow down?