There are tons of interoperability problems. Google put up this website a while back, before Apple announced they would support RCS interoperability with iMessa

There are tons of interoperability problems. Google put up this website a while back, before Apple announced they would support RCS interoperability with iMessage, that explains a lot of the broken experience: https://www.android.com/get-the-message/ https://www.android.com/get-the-message/