I agree with that statement- no doubt that Aqua would have made that change if they didn’t feel it to be a vertical move. I do find the subject of “tube rolling” fascinating though and personally wouldn’t be opposed to experiencing the available options. It definitely requires a level of trust with a reputable dealer as only each individual can define their preferences and the world of NOS tubes can become an expensive habit!
I’m not sure how much research you’ve done on the subject but I found the descriptions at Brent Jesse’s site to be interesting. The tubes for the Aqua La Scala can be found here