Looking at it from the Mentor’s perspective
You have raised some good points on mentors and mentoring. It is not simply “telling”. Nor is it “sage advice”. It is practical advice shared based on practical experience.
Before you look for a mentor it is worth learning why a mentor is attracted to mentoring in the first place. See I-am-a-choosy-mentor-9-key-selection-criteria. The more hot buttons you can press, the more likely you are to attract the right mentor.
As for critique, don’t be phased if the mentor-chooses carefrontations: the-dutch-uncle-approach to set you straight. That is part of the mentors role.
Finally, when you have made it, do not forget to pay it forward. That is how the game is played. See 3-benefits-i-have-enjoyed-in-mentoring