I've been using Signal for a while now but it doesn't have push-to-talk the way WhatsApp does, which allows my wife's practice (and, as a consequence, about three other practices - it's spreading like a virus) to use WhatsApp like a HIPAA-compliant Nextel walkie system. I am concerned about Facebook ruining it a million different ways, including those you list. Considering the fact that WhatsApp has been used for (A) distribution of child porn (B) fomenting of lynch mobs, they have the political cover to gut it however they want.
Unless I'm misunderstanding what you mean, Signal now has push-to-talk voice messages. I haven't used the feature in either service, so maybe they differ in some usability way. And I agree, censorship is popular when it's framed as preventing concrete harm in the present at the risk of potential greater harm later on. Most people will accept that bargain.