Besides misinterpreting copying the CSO York (as a super-lightweight tuba , when - in reality - it had the holy crap buffed out of it), I'm thinking that another reason for building some of these so thin is to make it just a bit easy to hold them at (yes, I'm judging) an awkward angle.
With EVERYTHING (vs. B-flat) on them, being cut to the quick (again: to get them down to only 16 feet long) I just wonder if someone might experiment with finding SOME place where two or three inches could be sneaked off of some new model (yet - somehow - still offering the remarkably good intonation characteristics of the Yamaha knock-off), and end up with an easier-to-hold instrument.
Notice (and the picture would better have been taken from 15 feet in the air, and zoomed in, but...) the full 90-degree mouthpipes on both my F and B-flat instruments:
![Image](https://i.imgur.com/HG6vrhl.jpeg)
...I've thought about this for a long-long time, but was reminded of it - today - when reviewing this amazing video:
![Image](https://i.imgur.com/rHtJqlm.png)