Not sure I understand the appeal. It’s still a derailleur, isn’t it?
Lots of (higher end) bikes moved to internal hub systems like Rohloff [1] that have proven to be very reliable, maintenance free and (other than higher upfront costs) are superior to a derailleur in almost every way.
Lots of (higher end) bikes moved to internal hub systems like Rohloff [1] that have proven to be very reliable, maintenance free and (other than higher upfront costs) are superior to a derailleur in almost every way.
[1] https://en.wikipedia.org/wiki/Rohloff_Speedhub