The magic technology is that it's not following the bluetooth spec. It's a custom spec that works remarkably well, because it's reasonably scoped and not written by a multi-corporation-for-profit SIG.

Their dongles for wireless audio work like magic too - as close to zero latency as I've found in wireless computer headphones.

You are telling me that a single purpose spec/software/hardware stack works better than a complicated multi use case/OS/hardware standard? Call me shocked.

My cordless phone in the 90s dropped less calls than my cell phone today, how have cell phone companies not managed to copy it?

My understanding is that one of BT's big problems is that it's underspecified, so every implementation is slightly incompatible. Only having to deal with one implementation is therefore probably enough magic, but the BT SIG can't just copy it without changing the spec.