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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
Then you need to think a bit more. The brake lever and hood is a major comfort and control interface, you make substantial changes to their shape in pursuit of aero gains at your peril. Ignore gear levers, they are already electric on all high end bikes and aerodynamically insignificant. Ignore cables too, as the switch to hydraulic brakes joins the switch to electric shifters in eliminating the last impediment to full enclosure, the unwillingness of Bowden cable to play nicely with tight corners.
gbj_tester-
comfort and control ... you make substantial changes to their shape in pursuit of aero gains at your peril
TT bikes wouldn't exist if comfort and control were always more important than aero
Regardless for a bar like the above in the drops the comfort in the hand would be the same. You just (maybe) lose out on riding on the hoods.
I am just surprised that no one seems to have done it, that's all
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.