I have read this strange myth about major label engineers not caring about sound here a number of times and am unsure where this comes from. Sure they have deadlines and large volumes of work, so they have to draw the line on perfection somewhere.
These companies can hire the cream of the crop, and it is with any specialty where it is highly competitive, if you do not perform well you will be replaced. Add to that the quality of studio equipment they can afford.
Check out some of the vids here to gain appreciation for these highly skilled pros that do very much care about sound and making the artist sound as good as possible: