Perfect!
I spent like many dozens of hours of research on this before I wrote the final version at Stackexchange here
https://unix.stackexchange.com/questions/804068/linux-mint-22-3-bluetooth-finds-no-devices-and-is-not-discoverable/804220#804220
..and in the process I realized that despite Microsoft saying they 'love' Linux, it seemed to me to be consistent that Intel, the main source of most Linux-unstable Wifi/Bluetooth cards, consciously avoid presenting the _full_ information that could easily make them work at once at all Linuxes; forcing dongles.