ADS-B ok i dont have it on my EU drone, but hey if u think about it im better off without it..
dont u think that little device scanning ADS-B will run without taking extra energy out of your batteries? offcourse it does!!!
not even to mention the CPU resources it will take of your drone while flying
in other words it will drain your batteries faster when u have the US drone which have ADS-B on board..
so actually yes im glad its not implemented in my EU drone if u think about it from that angle. im i wrong or? i dont think so.
If you're concerned about extra energy consumption: you could turn it off, see video at 1:45