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Pretty sure the number of folks who'd contemplate rolling their own loom, who don't already have the necessary kit, would be damn close to zero. Dropping a grand and a half on derailers, shifters and an A junction and battery left me rather reluctant to blow any more dough; in my case DIY was totally worth the time, and it was also fun.
In addition to tinkering tightarses, full-on gram-chasing weight weenies might also be tempted, given it's a tad lighter.
And it's a bike, not a 20t hydraulic hammer. Your soldering skills must blow chunks if you'd be worried about vibration.
Speaking of, my loom is made from single-insulated wires (probably Teflon, judging from how annoying it was to strip) harvested from better-quality USB cables, plaited with fuzzy twine, and that trick has been successful in preventing any buzzing or rattles.
As against the price of a solder station, a hot airgun, some adhesive lined heat shrink, your own time and the downtime every time a solder connection dies from vibration? I'm all for being a hacker, but in most cases is strictly for the lols because the mass produced solution is actually cheaper.