What city are you in? Sounds like you don’t have access to what we old hands would consider a “real” cinematographer. A guy who is stoned all the time and won’t accept 24 fps is, I agree, not a good choice. You are the ultimate decider, and your DP should be able to accept that, after explaining as best as she/he can why her/his own vision is “better.”
Rick Wise
Cinematographer
MFA/BFA Lighting and Camera Instructor Academy of Art University
San Francisco Bay Area
https://www.RickWiseDP.com