No, I'm speaking more about hiding voice-activation mode somewhere into accessibility settings page, as opposed to getting big shiny button "activate voice-activation" after first login or even enabling it by default with an option to switch to PTT afterwards.
I know people who consider voice-activation to be an accessibility feature, as otherwise it would be too difficult/distracting to be able to use VOIP.
A community should absolutely be able to disallow voice-activation, but disallowing it by default across the platform would be an issue.