How is more choice and innovation a bad thing? What actual cross-system limitations are you worried about?

I switch from iOS to Android seamlessly, as my digital life is platform agnostic. I am more invested in Google's ecosystem in terms of where my data lives, but until they remove the ability to export/sync that data (e.g. I can download all Drive files at once, and simultaneously convert them to Office or PDF format), I don't feel all that "walled".