I think the point is, if Apple (or Google or whoever) would be the clear market leader, they'd probably show total count and be like "whoa, look, our last OS was the fastest growing from since beginning of time!!!!" (showing X units sold/year instead of percentage/months). And all fanboys would go "woohhooo, AppGooSoft is so awesome, everybody buys it!".
And that would be true in that case, but why would anyone take time from a keynote to highlight a metric they're not good at? What Apple is doing right is getting the majority of their devices upgraded to the latest version as soon as possible. They're doing better than Google in that regard. Meanwhile during Google's keynote, they would say how many Android devices are shipping compared to iOS devices, and say nothing about how quickly people are upgrading.
Toyota is showing off their Prius and say that it gets 100mpg. You're sitting in the back saying "yeah but the Vayron goes 200mph, why don't you show off how fast your car goes?" Everyone is good at something and not good at everything.
The actual point the parent was trying to make is that Apple sux and Google rox, which is massively off topic.
