Bluetooth Explorer removed from Xcode Tools in 12.x?
Not only it's been removed, I've tried to use the Bluetooth Explorer for Xcode 11.4 and it's not functional.
I believe it is part of Apple's new changes of making their prperietary chips, M1  and thereafter,  part of a single ecosystem where if the iPhone and iPhone don't support other chips, like intel and Qualcom, then the OS XI won't neither.