This was a historical reason. When we started shipping last year we decided for 3 beacons since it was more fun with three than one prototyping beacon apps. Si

This was a historical reason. When we started shipping last year we decided for 3 beacons since it was more fun with three than one prototyping beacon apps. Since most of the typical rooms have 4+ walls we require at least four bacons to work with indoor. Adding more beacons does improve accuracy.