[coldtea]

Promoters (or, to be more precise, creator) might really not care to prove anything. And I wouldn't trust their arguments either.

If the change is harmless enough to try, one can just see for themselves.

And for things that work for some people but not for others, some general proof doesn't make sense anyway.

Nobody came and proved me how vim can work better for my editing than Emacs. I tried both myself and found out. Several for tons of other things that I adopted or not.