even where "blind obedience" is a motivating factor (turn-on?) for people, there are circumstances where common sense should (and hopefully will) prevail. This suggests that "blind obedience" is an illusion.
Surely "considered obedience" is a fair substitute - the attraction being that the slave is always evaluating, and either overcoming their reservations, or speaking up to prevent damage that could be a tipping point that destroys the relationship; this is in the interests of Master and slave, surely.