But I assume you don't go and change all your co-workers code just because they didn't do it how you would have done it?

I concur, and I think that is one of the most difficult aspects of reviewing another's code. It's difficult for me to sometimes differentiate between what is acceptable vs. what I would have done. I have to be very conscious to not impose my ideals.

So you are going to waste everyone's time getting another developer to write code the way you want? This resonates with me because at my company I get this all the time. At that point, you might as well close my PR and do it yourself, whatever way you want. I really like the advice from the book 0 2 1, to assign different areas of responsibility to people, so that there is no conflict.