I'm not going to multiple quote back
But corporately these decisions are take pen on a business case. Your business may decide not to go that way, which is fine.
One thing that stopped me from going Mac for a long time was the fact that the only mainstream WP software for it was Word, which is the most awful and hard to use software ever. However libre office and Open Office are available and I use that as a bettef(and free) alternative.
As for the flaws in Gmail, it's more about the clunky interface. It may play well with google mail, but anything else, and multiple mail accounts... Try Typemail and you will never go back. The native text app is pretty poor too, thanks to fellow Hexites, I found Textra, again streets ahead of the native app.
Although my Android phone was cheaper to buy, if I was charging for my time in re-configuring it, it would have been way more expensive than an IOS equivalent, which would have done what I wanted out of the box.
Im sure others will have different experiences, but in the corporate world, these things matter.
But at the end of the day, users, both corporate and individual have a choice, and neither Apple, Google nor Microsoft should loose sight of that. In the case of corporates,nth at choice may include considerable investment (like buying Macs) and they won't do that unless there are good business reasons. And having done it, they are unlikely to switch back in a hurry.