I think, in this case, it's more akin to a shipwright of wooden galleons saying they could make a table more cheaply than the guy who only makes tables for a li

I think, in this case, it's more akin to a shipwright of wooden galleons saying they could make a table more cheaply than the guy who only makes tables for a living could; or a medieval military swordsmith saying they could make kitchen knives more cheaply than the guy who only makes kitchen knives for a living could. I.e. someone who does all the same work that these niche "artisans" do, with usually even higher quality (because of actual commercial requirements and engineering tolerances being involved), often in 1/10th the time, repeatably at scale, as just one aspect of much larger projects. Similarly, in this case, I bet any boilermaker (or steam turbine engineer) could make a better flute mouthpiece than an instrument-maker could. At scale, for cheap. They're pipe fittings, with mouth gaskets!