I work in an industry that has done a lot of outsourcing and have managed offshore teams and have seen the local results firsthand.
Couldn't resist, just scanning some 35mm negatives from a decade or three ago.
Sadly, I agree their quality of late seems to be well below par. Maybe a victim of their own success ?
Not sure about "They could get better quality stuff outside the US". Their raw materials - mainly CXL et al. - is produced in the US and is good stuff. Their selection, manufacturing and QC seems to let them down. Specialisation in production - one man, one station, one task - seems to be part of their production process, judging by the various videos out there, but yet the finished product often fails to meet the consumers expectations.