I think it's instructive to see some of the rules (such as this) as descriptive rather than prescriptive---after all, one cannot by force of will still the murmuring in the heart, but someone who is genuinely completely committed to service will have few causes to hesitate.
Many spiritual texts stress obedience to the master/abbot/what-have-you both because of the presumption that the senior knows more than the junior, but also because it reinforces that the service is offered to something greater and not for the (material) benefit of the one doing the service.
I haven't had time to go over everything but I would be surprised if it's truly unquestioning rather than just unhesitating. Something whose purpose is not understood should probably lead to contemplation and then discussion with the abbot to confirm the understanding.
Many spiritual texts stress obedience to the master/abbot/what-have-you both because of the presumption that the senior knows more than the junior, but also because it reinforces that the service is offered to something greater and not for the (material) benefit of the one doing the service.
I haven't had time to go over everything but I would be surprised if it's truly unquestioning rather than just unhesitating. Something whose purpose is not understood should probably lead to contemplation and then discussion with the abbot to confirm the understanding.