Today, it is more about maintaining your suite of apps, the Cloud with all your data, the little blue bubbles in your group chats, and a host of other issues that are more a priority for choosing one platform over another, for most people. If I were to switch to Android now, it would be a huge PIA considering the 10+ years of platform integration and thousands of dollars of app purchases, iCloud, etc, that has made up a significant part of my digital life. I'm sure it would be similar for people going in reverse. Apple knows this, hence why services have become an essential part of their business.
The thing is, it is very easy in comparison to offer this cross device functionality, if you lock in your users and can simply make lots of assumptions about what software the user will be using. How much of that cross platform stuff works for non-standard browser or non-standard messenger?
And the cross-device stuff is based on cloudkit, so it’s easy for third parties to adopt and get those benefits using apple id rather than additional signins. Of course that has some lock in, which I recognize is so offensive to some people that the upsides aren’t worth it.