The thing is that everyone experiences BMB pain differently. Some people breeze through them while other do require sedation and/or pain relief. That one person can handle it with lidocaine doesn't imply that everyone can.
If I were to say, I've never heard of morphine coming close to making someone crap their pants and it's effective so everyone ought to have it, you'd probably have a response. In a like way. someone who felt as if they were having their soul sucked out of them through their ass might look at your suggestion that lidocaine is a plenty as being the talk of a crazy person. It's all experience and perspective. I'm one who feels like they're sucking out my soul and it's incredibly painful. I've had about 17 of the things and no one's coming near me with that drill unless I'm feeling no pain. I would honestly hurt somebody.