Currently I am using GraphHopper (well, Kurviger-GraphHopper in settings).
The reason is, that I had issues with BRouter unintentionally skipping waypoints App: Offline routing (BRouter) - #55 by linux-user
This may have been improved in recent App versions, I simply haven’t enough time to test.
Currently development is faster than I can test. 
But if the intention of this thread is, to remove one routing service - then keep BRouter!