This is a great list - thank you. I learned a long time ago to not use “you” or similar in code reviews, as it is too easy to associate a critique of code with a critique of the coder. Changing “You should change this” to “This should be changed” or even “We should change this” can make a world of difference.
Yes, the "we" in place of "you" is a meaningful difference I've noticed in code reviews. Having to participate in a development team has made me a bit of a nicer person, as my default reaction is to blame. But that's completely inappropriate.
It sounds like "this one trick" but it truly is that effective.