So if 20% of Macs sold are desktop models, 20% of a large number is still a large number. And 20% itself is not a minuscule percentage. That's my "glass half full", rose-colored glasses perspective.
Yes that is still a fair number of desktops, but no matter how you spin it that means desktop class Macs accounted for less than 2% of total corporate earnings — while I would be quite satisfied with 2% of Apple's earnings but in Apple's terms that barely rises to the level of noise on the corporate books.
My "Half Full" view is: As usual no specific unit sales numbers numbers were announced, so it is possible
Mac sales were unchanged or even up a bit from previous quarters, but the recent rapid growth in Apple's "Services" sector could could be what caused Mac sales to slip below 10% of total earnings. As a stockholder looking only at the bottom line I would have to cry HUZZAH!
as that means Apple is developing another highly profitable market area.
As a Mac Fanatic it gives rise to a "Half Empty" concern that Apple may become less willing to put development time, effort, and money into the Mac.