Since iPhones have a much larger market share than OSX devices your point is moot. But don't let that stop you from blabbing on about it. Or the fact that Apple has sold more iWatch products than all other smartwatches combined.
(a) iOS market share is around 30% c.f. 70% for Android - and these days, that Android figure includes a lot of high-end phones from Samsung et. al. Apple could probably double their target market by supporting Android. On what planet does that not make sense?
(b) Most of the competing smartwatches suffer the exact same drawbacks as the Apple Watch: high price, poor battery life, normally-off emissive display, too bulky/delicate/expensive for sport. The FitBit (not a full smartwatch - but nails the most compelling use case of smartwatches) outsells the Apple Watch by a factor of two.
Of course, the iPod, iPhone probably ended up selling more Macs... but they did that indirectly, by promoting the brand, despite being supported on PCs. If Apple think many Android users are going to by a Watch plus an iPhone to link to it - or even look at a Watch if it doesn't work with their phone - then they're holding it wrong.