That's kind of the problem though. jlc/pcbway aren't just "cheaper", for anything 2 or 4 layer that doesn't require special coatings, thickness, or finish such as gold fingers, it's just so cheap and fast that it makes no financial sense to buy locally. You'd pay several hundred percents more to get the boards maybe 1-2 business days earlier.

In addition, china is where all the world's pcbs are made, even for commercial stuff, it's not unreasonable to expect them to deliver higher and more consistent quality than home fabs.

The gap only begins to slightly close at more complex boards, but not that much.