This may sound crazy, but remember there are billions of iOS devices out there in the world, and I don't think X boxes plus windows game machines count in the billions.
Its true Apple hasn't won the hard core gamer market, but they are no longer the niche player that had to cater to windows users.
There should do, albeit not for gaming but most of the office software is Windows with DirectX support. You won't be playing on, though.
Also looking at Apple's sells every year since the 6 came out, I doubt very seriously that Apple has sold more 6 phones than 6S, 7, 8, and X phones.
Also if the 6 from 2015 is not a powerhouse, neither is Samsung S8 that was just introduced last year....
http://bgr.com/2017/05/23/iphone-6s-vs-galaxy-s8-speed-test-...
Being able to run anything slightly demanding is other thing, but you can't argue there's no support.
Also, the benchmark you linked is for application load, which is heavily influenced by storage speed and load method (android has to JIT compile sometimes) and has almost no impact from the graphics' performance other than the bus between CPU/memory and GPU
Oh wait, you can't.