I have no problem with any level of tech on any sort of C&V bike, the part just has to have the right milieu. For example, a wheel with a cassette hub on a C&V bike can work because we all know there are cassette hubs out there that look the part that can be laced to modern double-walled AL rims that also look the part. What doesn't work IMO is when you put some sort of crazy carbon wheel with 8 bladed spokes on a C&V bike. Even though the two wheels accept the same cassette one sticks out like a sore thumb. The C&V option might weigh a little more, but if that is a concern to you and you have the dough then its a fools errand to start with a C&V bike anyway. The same goes with threadless headsets, brifters, drivetrains, carbon, and pretty much every bike tech advancement.