In article , Dan Jenkins
wrote:

I want bluetooth for only two things (but you can suggest more).
(1) To transfer files back & forth without having to join a local LAN

apparently you aren't aware that it's slower than wifi or usb,
otherwise you wouldn't be asking for that.

Thank you for trying to help but please don't try to help if you're going
to completely ignore the original post by suggesting everything I already
know and which has nothing whatsoever to do with the original question.

Powerful Bluetooth hardware is the correct answer to the question.

no it isn't.

WiFi is impossible for a PC that is not even on a LAN.

yes it is, and since it's in your house, why wouldn't it be on a lan?

USB cable is inconvenient when going from floor to floor.

that's what wifi is for.

Same with speaker cables.

wifi can replace that too.

Powerful Bluetooth hardware is the correct answer to the question.

no it isn't.