I am a PhD student. However I published more top-ranked journal articles than my supervisors within a 3 year period of time. As I am becoming more and more experienced, I feel uncomfortable whenever I talk to my supervisor for their comments on my PhD thesis. The comments are not penetrating and they do not seem to understand. It is hard for me to take their advice as I do not trust them enough academically. I told them I am not going to win a Nobel prize and I just want to finish my PhD to move on with my life, not a piece that I will be truly proud. Should I express my concerns to my supervisors openly by saying I am not comfortable with their advice, or what should I do with it? They are nice people but academically speaking, not strong enough.
Towards the end of your PhD studies you should be the ultimate world expert on the narrow topic of your thesis. You should be familiar with all published related research, and have added new knowledge through your own research.
It is your responsibility to convey that knowledge, in your thesis, in a form that other researchers in your area can understand. It is essential to getting your PhD that you convey it in a form that the committee that evaluates your thesis can understand.
If the examining committee don't understand it, they should reject it. At the best, your writing is not good enough. At the worst, fuzziness in the thesis reflects actual muddled thinking and the research needs more work to sort that out.
Regardless of whether your supervisor will actually be on your examining committee, they are the best surrogate you have for testing your thesis. If your supervisor does not understand your thesis, it is not ready to submit.
Looking at the bigger picture, the smarter you are, the more academically advanced you are, the more of your time you are going to spend explaining things to people who know less than you and need more explanation than you would. Your thesis is a good place to work on those skills, with an expert audience who will give feedback.