iMessage is just another text app, nothing special. And Facetime? Who cares, there's other apps that do video chat just as well.
Apple needs to stop being douches and include RCS into the iMessage code to allow it to work well cross platform, but they purposely don't because they like people locked into the walled garden.
We've been using Google Messages app for years, and since RCS was introduced few years ago, it works just like iMessage with my family and friends who mostly have Pixel phones. High res photos. See people typing before they send a text. And it works very reliable.
I never saw the big deal with iMessage
In my circle of family, friends, and coworkers, it's probably 60% Android / 40% iPhone.