Until cross platform messaging is a good as iMessage and FaceTime from an iPhones user’s perspective it’s going to be bad.
I have only ever used an iPhone (ignore non-smart phones) and have been weaned entirely on Apples stock apps. Conversely almost everyone I communicate regularly with is also an iPhone users. I do use other platform for communicating with non-apple friends but the experience is significantly poorer.
I couldn’t say how many people existed within this almost exclusively Apple ecosystem but I would hazard a guess that there are a few.
Apple uses iMessage as a moat against people switching to Android. They intentionally degrade your experience for their benefit.
Feel free to insert the equally stupidly large number of iPhone users for your particular geographic location.