Yeah higher production lends itself to more failures but also more that pass. Oddly enough I’ve seen productivity studies over the years that show larger batches often lend themselves to less QC issues by volume than smaller batch production. You have to consider a similar concept to economies of scale in production QC.
Typically larger batches require more mechanization. More mechanization lends itself to less human error. Less human error increases QC on most continents.
Consider miller lite vs a micro brew. Taste preferences aside, compare the consistency of miller lite to your favorite micro brew. Each batch from the micro brew will have wider variations than miller lite because miller lite has the process mechanized and has extremely tight tolerances in every step along the way.
It sounds good in theory, but assembly is not automated in even the most high volume shop.