Well, with iOS 10, A5 devices will most definitely be left behind and maybe even A6 and A6X devices will also be left behind, with iOS going all 64 bit soon, that should greatly improve the lowest common denominator for apps
Those devices don't explode suddenly if they don't get another ios update. Developers will continue to support both ios versions for a while. The potential installation base is too big. Maybe some people will upgrade immediatly, but i guess it will be a rather slow process.
MBPs are still arguably the best laptops available. MBP's are not gaming machines, but they are good for 3d graphics, video editing and other highend tasks.
What are you talking about? Of course they are not gaming machines, but they arent even using Intels latest technology. Its the same processor architecture from 2013. And the M370x is a Cap Verde chip from 2012. Slower than the competition. A GM206 chip would have included HDMI 2.0 as well as a HEVC decoder, but no. On the desktop side the mac mini, Mac Pro look even worse.