[FpUser]

>"Lots of (higher end) bikes moved to internal hub systems like Rohloff"

Those would be "higher end touring / commuter bikes. Road / racing bikes use motorized derailleurs like Shimano Di2 on high end. Rohloff and other internal gear hubs introduce noticeable resistance which is ok for regular riding and not really acceptable for road / race.

[hamishtilde]

Gearboxes are seeing a little bit of usage on Mountain Bikes, this is largely around moving weight to the 'sprung' part of the bike to improve suspension performance and also protection/maintenance advantages They still have resistance/efficiency and cost disadvantage though https://pinion.eu/en/

[hinkley]

Think you meant unsprung weight, yeah? The Pinion system seems to move a lot of complexity to the bottom bracket, which is generally on the unsprung part of the bike, the same as you would move weight away from the wheels on a car so they can stay attached to the road more of the time.