I always use WhatsApp or Instagram for non-work video chatting. FaceTime is completely irrelevant unless you just happen to have your entire social circle using one company's hardware with no exceptions.
Unless you expect others to be happy with an in-browser call experience while there are clearly other options available which are cross platform and superior. Yes, superior as well.
No option is universal (not one of my kids' friends uses WhatsApp or Instagram, for example), although Zoom is near-universal in my family's world. FaceTime is a great option for friends/family who use iOS, and I'm glad to see Android and Windows support. It wouldn't surprise me to see it join Apple Music and Apple TV as an Android-native app.
I think the difference is those are paid subscription services - so the rare Android user who decides they want to pay for either of those services can - and the iOS user who is already paying with a family plan can share it with their kids' or SO's Android phones.
With FaceTime, it's a free service; and supporting it on Android would just be a cost sink.
My two cents. :)