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Can I use on it my company provided Adobe suit to create images, sprites and mockups and then use them to create iOS apps?

Sure, just install OSX-KVM and run macOS as a VM

And it's all perfectly legal and as user friendly as picking up brand, spanky new MBP from Apple Store?

Well, you also get $1550 in cash when buying the base model. I am sure that this is more than enough to pay someone to make it just as user friendly.