I think the laquer coating is the mil-spec. The poly coating stuff was made to please the American market - who they believed saw the laquer coating as a reliability problem (.223), and generally as a useless negative on the ammo. If there was ever a complaint on that ammo, or any reason to perceive it as cheap or junk - it was the laquered coating.
Just what I've heard, might be BS. BTW...the poly coated stuff ain't that great. I've shot hundreds of them in my AR's with zero problems, but when I shoot Lake City brass ammo after a session of Wolf poly, the spent brass cases have that poly stuff all over them - almost as if 60% of the case got its own poly coating pressed on. That tells me that the poly stuff is leaving a film inside my chamber. No biggie.
I'll keep buying and shooting it because it doesn't malfunction in my AR's. It's dirty, but then again, the AR is naturally a dirty gun, so who cares about 10% more fouling. It's all a mess in that rifle anyhow. Invest in brake-cleaner.
(off topic)...this shortage of ammo goes to show how desperately dependent we are on foreign ammunition imports. All it takes is one Hillary to write the EO, or order the State Dept. to put a hold on that, and folks, it's all over for your AK's. It will be murder on AR's too, but not nearly as bad. Scary thought, but something that's been bouncing around in my skull. Her hubby put an end to U.S. surplus ammo sales. It isn't out of the realm of possibilities.