There has some with the lever in Carbon Fiber..

they are useful with really steep drops so you can hang on without feeling like tucking for a roll over

casual riders like them too .. touring folks too

German Dieter Runkel won the Cross Worlds in the mid 90s, used a 4 cable monster bodge to make them
from current MTB and road levers .. bikies think the gear was why fast riders win, that is a Given.

then the CNC folks took over the idea. now the production is over 'there' and not Europe.