You're welcome to cripple yourself (and you'd be in illustrious company -- just about every famous name in Emacs's history has suffered severe RSI); I was just trying to answer your original question.
I don't feel crippled, by the way. But since I like keeping an open mind, if you have any actual arguments, please feel free to share.
In the mean time, if you're also open, I recommend checking out some counter arguments, for instance in the work of Larry Tessler.
But I don't think modal/modeless is either/or. It can be (and I personally use) both.