I don't know -- I do use the icloud/appleID to share cut/paste between my devices or have my watch unlock my mac, but all my files are stored on dropbox, my omnifocus is in OF's storage, passwords in 1password's storage etc. I use MS word, not Apple's crappy pages, etc.

I have used android and windows. It's just that the Apple stuff tends to suck less (but not always, per the examples above).