One big issues was poor crypto performance. I managed to convince Google to turn AES-GCM on with SRTP! https://bugs.chromium.org/p/chromium/issues/detail?id=713701...

I am sure there are other issues as well. The WebRTC implementation in Chromium is controlled by Google (they have all the commit bits). If they don't agree with your change it isn't going to land. It's a tough position to be in for other businesses and Open Source projects even.