Yes, I've never considered worker skill (much less race) to be a factor in the low quality of mass-market items.

The mass production process and target price point seem much more relevant.

That said, mass production processes are also tailored (ahem) to allow specialization - it's doubtful that one person takes the garment from fabric bolts to completed garment as could happen in a bespoke, individual tailor context (though I'm sure custom garments are generally produced by teams of workers as well!)

So individual workers are likely to be very highly skilled in their individual specialty step and equipment, but may not have the range of production and design skill of a master craftsman.