> I get asked sometimes why I wrote code a certain way by the very person who suggested the change

This drives me crazy. Even worse is when I get told out of the blue that something I did is wrong, by the supervisor who told me to do it that exact way some months ago.

This has happened almost everywhere I have worked, and none of those places kept change discussions to a specific ticket. I'm going to push for this approach more in the future, it sounds like the right solution.