You are both there to do a job. The owner will probably see the drywall as important to finished product as electrical.
I did a house a few years ago and the HO decided not to finish the basement right away, but wanted it all roughed in. I would come back and trim out later.
Months later I get a call from the HO. Two bedrooms were drywalled, painted, carpet laid and mop boards installed. My boxes were about 2 and a half inches too deep. No way possible.
So I start looking at the walls and I notice that they are kind of flared at the bottom. A closer look revealed that the dry wall was about 3 inches from the wall at the bottom. The drywallers cut all the sheets too long and just pushed in the bottom as far as it would go and called it good.
I told the HO I wouldn't do the finish work until all the drywall was fixed. That also meant replacing the carpet, as it was three inches too short all the way around. I think he told me it cost him 6 grand to have it all reworked. IIRC, the drywallers used glue, so that meant removal and preparation for new sheets was fairly labor intensive.
And that's just one of my encounters with their brilliance.
If the HO's are so concerned about drywall, why do they hire bozos to install it?