Ugh... why do you have to do this to us Microsoft? I log into a Microsoft account anyway, but I always make it local first because signing in with my Microsoft

Ugh... why do you have to do this to us Microsoft? I log into a Microsoft account anyway, but I always make it local first because signing in with my Microsoft account during setup would always name my user folder as my first name but missing the last letter (I don't understand why.. my name is only 6 letters long).