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Also if you crash, you've fucked bars and two lever sets, rather than just maybe a lever or maybe bar and lever. Teams with big budgets don't do it, even though they know it's possible. They might if they thought the gains were worth the wrenching effort. I've never used integrated levers but I bet they'd be inferior to proper levers and braking is still pretty important on pro TT courses. Those Tulas, etc. are better suited to CTT dragstrip courses.
hippy-
Folk's'll pay for oversized jockey wheels and £150 chains, I'm sure I could sell my one-use super-aero bars. Only £980/set. No refunds or warranty offered.
I saw this bike which is what prompted me to think about this, if you turned that front bit into a brake lever instead of a weird little handle:
frankenbike
I should have done more googling, this Zipp bar has it too https://www.triathletesports.com/zipp-vuka-aero-bar-base-bar-brake-levers/
But no one's done drop bars as far as I can tell?
Those reasons have never stopped people before!
I'm thinking that integrating brake levers/hood area/cables into bars, removing STI levers in favour of Di2 blip/climbing things would save a fair bit. Not worth it for normal people obviously, but for a pro in the TdF or whatever who can afford to spend £1000 on a fully integrated cockpit I can imagine it.