> I continue to think there's a paranoia & level-of-concern that does not match what modern hardware can do.

I think this is related to the fact that most wireless headphones people have experience with are Bluetooth.

BT headphones have lag, and, when used in duplex mode, have terrible quality. And this lag adds to the one introduced by the conferencing software.

I've got myself a Jabra headset that communicates over DECT. This thing is spectacular. No discernible lag (as tested with games) and the mic quality is better than what I hear from people rocking Bose and Sony BT headphones. The range is great, too. Much better than what I get from my BT headphones.