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This sounds like a call to a list, inb4 di2 thread...
Electrics brakes
Electrics power steering assist
Electricsmagnetics bearings
Electrics tyre pressure monitoring
Electrics disc brake pad monitoring
Kinetic Energy Recovery System
Dynamic Drag Reduction System
Brake Rotor and Tyre Surface Temperature Monitoring and Alarm
Electric Automatic EPO Injection...for saddle sores, amirite?I'm sure I could come up with more useless gadgetery.
Bottom Bracket gears are perhaps playing catchup, but only as materials have improved, there are 14 (or more) speeds now. Old ones (over a 100 years ago) were 3 speed I believe.
But then nothing is new atm bar e-shifting and I would love another thing that can run out of battery, please.