Earlier quoted context omitted.
The entire Mac platform is less than 10% of their revenue, for what it's worth.
That's always the argument from the business standpoint. How much of their ecosystem is on a foundation of professional Mac users? A majority of the professionals I know won't buy the current touchbar model MacBook Pro. Does that market even matter anymore?
iOS can't replace Mac OS (yet) for serious work. So instead of letting Macs atrophy, they should invest in making Macs the best possible desktop and laptop computers for serious work. Own whatever amount of that market they can. Keep those users in the Apple ecosystem.