The problem is the hardware AND software targets for mobile devices is still growing and evolving rapidly. Rapid, very different hardware variants- Screen size

The problem is the hardware AND software targets for mobile devices is still growing and evolving rapidly. Rapid, very different hardware variants- Screen size, cpu power, GPU power, storage mechanisms. Software: 3d Apis, third party Apis, if you want to take advantage of a new framework you may not be able to because of people either unwilling to, or not able to upgrade. It's completely different from the PC world.