I use a Mac but an Android phone. Android because I require the ability to install apps from arbitrary sources, including piracy. Mac because modern Windows is so contemptuous towards its users, and desktop Linux falls apart unless you know the intricacies of its internals.
Anyway, transferring files between the two was a pain in the butt that eventually grew so immense I reverse engineered Google's Nearby Share and made this: https://github.com/grishka/NearDrop
Though yes, I'm not North American so iMessage is just a non-issue to me. I don't know anyone who uses it. No one uses SMS for actual messaging between people, everyone's SMS inbox is 99% OTP codes and various other automatic notifications. Literally everyone who I communicate with is reachable through Telegram.