The objection is not to controlling TLS on a private network. The objection is to using a method that can silently intercept connections to devices you don't administrate.
If someone doesn't want to install the root cert, then "use your own network" is a perfectly fine response.
If someone is upset that the TLS security model is broken in half, then "use your own network" is not a valid response.
If someone doesn't want to install the root cert, then "use your own network" is a perfectly fine response.
If someone is upset that the TLS security model is broken in half, then "use your own network" is not a valid response.