Only small companies here (North EU - Sweden) use Mac + Gsuite + Slack + Zoom as a stack.

Companies over 20 staff are on Windows laptops + Office 365 E3 or E5.

Android and iOS? Sure on the phones...

What "clients" are you talking about? Edit: Re-reading I think you mean clients as in general computers, not business clients. Yes, more of the world is on phones but that is due to cost and society (ipad/iphone kids or third world on android). Real work is all done on PCs/Macs.

Schools are on chromebooks for the kids and Windows or Mac for teachers.