Why Apple Seems so Reluctant to Adobe's PhotoShop?

Apple mentions that there has to be a direct connection between the platform provided by Apple and its developers so that they can jointly produce the best apps that the world has seen and hence everyone wins - Apple sells more products, and the developers reach a wider audience.
Visit here:- http://itservicenumber.blogspot.in/2016/12/why-apple-seems-so-reluctant-to-adobes.html