I too have issues with the Nerf factor.
Its why Jared Sorenson wrote Octane. He got fed up with characters not being what they were supposed to be because of dice.
Ninja killer who keeps missing, Ninja Accountant with no skills who killed a horde of bad guys.
But saying diceless games make judging what you can and cant do too hard isnt true. Just because its diceless it doesnt mean it doesnt have a system. For instance Castle Falkenstein requires players to use cards instead of dice.
I think what you meant to say is that games without some sort of randomization tool, be it dice or cards or a twister style wheel (which would be fun wouldnt it) or even a coin are hard for you.
either that or the crux of the argument is really about narrative play.
All of that is neither here nor there though. Using the diceless system we have here, (because we dont plan on having dice) what would make the system better. Or if it isnt working for you, what would make it work,... besides dice.