People can’t think for you any more than they can spar for you.
Constantly questioning your approach is just as, if not more crucial to progression than physical time spent on the mat.
In addition, while it’s smart to respect a coaches experience and to assume reasons behind what he or she says and does, question everything (in a learning/intellectual context, not heat of practice or competition).
For example, the first black belt I met, Chris Haueter told us back in the day that passing guard was about passing the hips, not the legs.
While the preceding idea is great food for thought, what does it really mean, and what was the intention(s) behind Chris saying it?