Re: Aikido is useless without atemi...
I agree with all of the above. To let other arts inform what you do is a valuable practice, that prevents you from stagnating or from having a skewed view of reality. Simply tacking on stuff from other places is a potentially harmful practice, because you will have to mentally "shift gears" to access a skill or movement that is trained differently from your primary practice. That shifting of gears, no matter how quickly it happens, has the potential to create holes into which the opponent can attack.