Yes, I agree that accuracy is more important with countersunk screws. But just about all cars have counter sunk screws on the underside of the chassis - it's not as if they're a new idea
With latest CAD/CAM CNC and all the rest of it, there's no excuse for the major manufacturers to get it wrong. It will always be more expensive though because it requires two operations to produce a countersunk hole, rather than just one as well as a greater degree of accuracy.
Tweak has always existed, but in the 'old days' no one worried about it
People were more worried about their 1700 SCR lasting the full 5 minutes!