This is the classic case of "perfect being the enemy of good"
Interoperability with iOS and Android is strictly an improvement and a good thing, but nope - it isn't perfect so let's endlessly poop on it.
Let's not get the point of the article twisted. I think the interoperability between the two is absolutely a positive. Google's RCS implementation is what I targeted in this article because I've repeatedly had several issues with it. It has nothing to do with interoperability between the two. Android-Android is affected the exact same way by the issues I mentioned.