That was a very good read, a lot of interesting info and argument from some frame-building heavyweights: I learned a lot. I revise (sort of) my notion that the newer air-hardened steel alloy tubesets are as light or lighter than the average chrome-moly sets of yore, but that was just based on a cursory scan of the published specs on stuff like Reynolds 853 and the later Deda and Columbus steel...looks like a lot depends on whether the Tig-builder uses a heavy-gauge headtube, etc. and what's being compared to what.
Seems like the big guys all have respect for each others craft, no matter how they join the tubes.
Thanks for the scoop, Scooper.