That reminds me of myself. I remember when I moved from screen to tmux and the default "master" key changed from ^A to ^B. All the time lost changing it back to ^A in .tmux.conf. In the end I simply got used to ^B and that's what I have.
I've gone as far as to open bug tickets for open source projects arguing that the defaults should be changed so I don't have to configure as much software when I move to another computer :D
Yes, defaults are super important! And in my opinion one of the big shortcomings for many cli applications.
I try to keep the defaults when they make sense, and I try to make my configs add to the experience but not change it too much. So it's nice if it's there but I'm still productive on a clean system.
But ^A in tmux is one of those changes, I think ^A is so much more ergonomic (and used alot) that I have it remapped for that reason. But I still have to remember the default binding.
I've gone as far as to open bug tickets for open source projects arguing that the defaults should be changed so I don't have to configure as much software when I move to another computer :D