Fair enough, so.
I'm one of those people that'll never fly on them so I guess I'm biased when it comes to O'Leary and what Ryanair do.
The idea of having to set up an account with them just to fly with them would definitely put me off flying with them if I wasn't already put off!
It's nothing more than a mass data cultivation project for their own benefit sold as an enhancement of the overall experience for the passenger.
Also, choosing to not store your passport and CC details kind of negates the potential booking/time efficiency of your account.
Anyway, the joys of being able to have a choice!