That's a fairly comprehensive list you have there, Andy. I wrenched for almost 40 years and there is only one lasting absolute hate I have; internal routing of brake hoses/housing and shift housing through handlebar-stem-frame tubes. Turns any line replacement into a PIA that takes significantly more time than anything that is external. From a shop manager's perspective I didn't let it bother me too much since I charged more for the work to cover the labor time.
Yes, I understand it has aerodynamic advantages, we all know the weekend warrior certainly needs that! Yes, I understand it is totally rad looking and elevates the bike and rider to the next level of sweetness.