You work for them. they are paying you. Just because you know how to turn some virtual dials doesnt exempt you from getting input from the people paying you to turn the virtual nobs. its going to save you some time having someone there to guide you on their vision. If not you are going to spend alot of time getting to the end to find out you went to the wrong destination. Im sure even sneap got some input from alot of the guys he has worked for. youre like a contracter getting paid to build a house. the owner still gets to come in and pick the color of paint, carpet, etc. I agree they dont need to be there while you clean up trax, quantize drums, etc but they should have 100% freedom to give you direction on their vision. Its your job to set your ego aside and help them realize their dream with your expertise and guidance.