Let me be clear - if you have a set of nice tubes, and the builder uses geometry that doesn't work for you, you have a crappy bike for your usage. If you have a set of tubes that the builder built poorly...for instance too much heat...the tubing sticker doesn't really matter much. Your bike is likely 80s IC lugs, so craftsmanship doesn't enter into things the same way...but sloppy is sloppy. Take a look at bike boom Raleighs from the early 70s...Reynolds 531 didn't stop my Raleigh International from being a turd. A turd is a turd - regardless of the tubing in the turd.

The tubing is not really an integral part of how a bike feels - what the builder does with that tubing is an integral part of how that bike feels. I'd rather chase bikes from builders I like than specific tubing, nor does tubing make a bike special in and of itself.

FYI - most of the top builders use a variety of tubes in customs...because they're parts matched with the builders skill. The tubes have no intrinsic special qualities that recommend them in and of themselves. Vanillas don't have tubing decals