Push-to-talk is a feature, not friction, as far as I'm concerned. I refuse to use apps that only have auto-record.

Friction is not an automatic bad thing. The fact that you have to continue pressing down the button to keep using the feature is friction to stop you from unintentionally using the feature

There isn't a single person on this planet that has a good voice activated mic setup unfortunately.

Also once the session is up, it's too late for your purposes. PTT or "just don't talk" is not a solution at all.