India 42, are you sure you are expecting the right stuff from Flarm?
It displays threats.
Example: when passing a circling glider, your display should light up when the glider is pointing at you, but should not otherwise.
It ain't radar
And it's not radar you want. Virtual radar displays on Skydemon etc are entertaining but you really do not need to know about all the traffic around you. It's only the ones that might hit you that are important!
That's why I like FLARM/PowerFLARM. FLARM was designed as a collision warning device and if it can help warn gliders in close proximity of imminent collision, PowerFLARM, with it's greater range, must work even better in other aircraft which spend most of their time travelling in straight lines. The display on PowerFLARM portable certainly gets my attention if it bleeps and flashes red but immediately afterwards (and most of the rest of the time) it is crucial to look out. Apart from anything else, there is still lots of traffic without electronic conspicuity.
So I hope that any system based on ADS-B in/out has collision warning algorithms built in and is cheap enough to allow almost everyone (including drones) to fit it.