True. I don’t understand enough about the technicalities of ADS-B to know if you could get FLARM-equivalent performance from ADS-B data. If that works, then great.
For instance, this year there will be 100+ gliders and light aircraft in the immediate vicinity of Lasham before the tasks start at the European Championships this August. If they were all squawking, it would be a mess but FLARM seems to be able to cope as they all carry it.