Its not even the deep integration that gets you. Being able to do something simple like copy a Google Meet link from your iPad to add to a WhatsApp group on your phone removes so much friction. I can't tell you how many times I've mis-typed a q for an a or an o.

An unsung hero is iCloud.com. It doesn't get as much love from Apple as it should but the online versions of iWork are, in my experience much higher quality than Google or Microsoft's equivalents.