Then why do I see so many posts on different platforms or youtubers saying that the only thing that is keeping them fro switching to Android is iMessage?Meh. That's not really good evidence to support your contention about North America.
For me, personally, it wouldn't be the only thing, I'm invested in the ecosystem and as a photographer I prefer to use mac, ipad, Airdrop etc
And I also use the Apple Watch
Also better support and app quality