> The principle dev reviewed every single commit and enforced a consistency across the code base that was better than what any tools ever could have done.

How was it so much better that it justified that level of busywork on the part of the senior member of the team (and busywork for everyone else, to fix the style nits they enforced in review)? I would have guessed that taking a few hours to install and configure a formatting linter to free up the principal dev's time to focus on other things would have been hugely high leverage.