While I can see this in some techniques it doesn't sound right for all. How can a nikkyo not hurt? Sankyo? Hijishime?
I've been controlled against my will many a time with a nikkyo, sankyo and even yonkyo that was completely painless.
All these techniques are in the end about controlling or attacking uke's center. You don't need pain compliance if you are attacking uke's center. If you rely on the pain compliance alone you are missing a great deal of the technique.
With that said everyone will "most likely" spend a great deal of their training years giving and receiving painful techniques. Like I said above, the pain is most likely the birthing pangs of great technique. The hope is to one day have such great technique you won't have to have the crutch of pain compliance.