From a manufacturing perspective most duplicators have simply retrofitted existing equipment to produce discs. That was intentional from the beginning to keep costs lower unlike the DVD to Blu-ray transition. Despite the move to triple layer for titles (such as Braveheart, Gladiator, and SPR most recently) which allows for less tolerance, the actual QC spec for the discs appears to have stayed the same as their standard BD counterparts. It is definitely frustrating to say the least, but as you pointed out this very well could be the last ‘hoorah’ in physical media for the studios so playing the ‘good enough’ game may be all they are after. Fact is, those of us who are deep into the hobby are buying it regardless of the issues.
Edit: I am seeing AV sync issues in MakeMKV with Gladiator. Are you?