Comment by manquer

Outside this list Safari's support is limited or nor for many other APIs. MediaRecorder and many WebRTC APIs have no clear roadmap for support.

Many APIs including getUserMedia and all of WebRTC are not supported in WkWebView (only way Firefox/Chrome works on iOS due to Apple policy blocking them from building their own browser) Means some apps will only work in iOS-Safari and not in iOS-Chrome/Firefox.

None of this has to do with privacy, being able to record media locally without sending to STUN/TURN server increases privacy not reduce it.