I thought the tubing was heated, the lug was put in and after cooling down it should be create a very tight fit. Have heard it was also the reason why the carbon ones were slightly less durable. Carbon tubing can't be heated like aluminum can.
I am wondering whether they (Alan, Vitus and co) will ever get the appreciation quality steel frames of the same era get now. The aesthetics should not be the problem. Imo a well polished such frame like in my boot looks ace. The palmares is also there.
Yes but Vitus/Duralinox/979 etc. are 'internal' fitting lugs so expanding the tube with heat before fitting them will work well and make a tighter fit whereas Alans are 'external' lugs like a steel frame and the tubes fit into them so the 'gluing and screwing' is the only way to go. TVT are 'external' type as well aren't they? I've not had much dealings with them so I'm a bit vague.
I would think that Alu/Carbon frames of this type will become more desirable, it's just the durability question that could put potential purchasers off. It wouldn't stop me getting one.
On flexibility, all frames bend a little when the BB is pushed. Don't forget that the tyre also flexes a bit so some of the movement is here.
Today is the yesterday of tomorrow.