The choice of "which is default" is up to the user, by setting EDITOR in their shell init scripts.
Ah-ha! Bloody difficult changing any sort of config file that might give you the editor of your choice, if you can't use the editor that you did not choose.
Why is ee any easier than vi? Simply because one of the e's stands for "easy"?
No, not 'cos it stands for easy. But because it has got the instructions at the top of the screen by default and has simple and explanatory pop up menus.
If I already have vi command memory muscled, ee is not easy to me.
Yes! New users do not have it 'memory muscled' <rhetorical>do they?</rhetorical> Nor do I (and I am not new).
Escape - Bang - Whoosh - Flip ... oh, sorry. How do you use vi again?