@edheil It was really the switch from dial-up to broadband Internet that did us in.
With dial-up, you could always air-gap when required.
Broadband and Wi-Fi? You can turn on 'Flight Mode' and.... something *might* get disabled, deep in the bowels of your OS and NIC and management CPU. You don't know, though.
Pulling an RJ-45 cable out of the phone jack was a MUCH more verifiable solution to privacy.