I haven't used Facetime so I can't compare but Duo just works as well? Have you tried using it? Also, have you tried video calling someone using Android phone using Facetime? And what's wrong if you tell features that make your app stand out against the competition or should they really say on their probably 50th update that it's easy to install?
My colleague had been invited to visit both Apple and Google (former CERN employee). He said the contrast was very stark. In Google everyone was young and looked like they where having fun, at Apple where the old grumpy gray-beards with decades behind them.
And he would usually his story with: -And I've been an Apple-fanboy ever since.
That is a China problem, not a Duo problem. Sadly Google is not the company it once was, and has taken steps in the wrong direction, but it clearly has the moral high ground on this front.
1) end to end encrypted, and
2) we’re constantly making optimizations
3) uses AI to reduce audio interruptions,
4) and Excitingly! Coming Soon! we’re rolling out a new video codec
5) that works with very low bandwidth connections
I dunno I use FaceTime, it “just works”