It's equally good for Undo to be on control _ as on control z. It's equally good for scrolling to move the cursor as to not move it. It's equally good to have Lisp as a scripting language as JavaScript. No, really, I mean it. It's not a big deal in the big picture.
And Emacs choose perfectly good, perfectly sensible defaults on all these things back when it came. (That can't be said about all editors from that time.)
It's just that in the 30+ years since, the world has converged on other defaults. Every little thing is done different than you're almost certainly used to - yet not different enough that anyone can claim it's somehow superior (unlike its modal cousins from the same period. I think their claim is dead wrong, but at least it's different enough that they can persuade some).