People don't realize that processing bottlenecks typically happen with the hard drive. The SSDs in these things will take care of that. You're not going to be running some CPU/Graphics heavy game, no but most things will be just fine including PhotoShop.
Yes and a lot Mac users don't even use Photoshop. I have many friends and family who are Mac owners. If you asked pretty much all of them about Broadwell and Skylake they would have no idea what you're talking about. If you asked them about Dual Core vs Quad Core you would get the same reaction. The average Mac user only knows very basic stuff. The rMB is perfect for anyone who is in need of a computer that can do everyday tasks. Intensive graphic design or gaming doesn't fall under that category. A professional in that field would already know the rMB wasn't for them and most gamers prefer PC. Therefore anyone complaining about the rMB is just looking for attention or looking for an argument. It's not meant for a small fraction of people. Period.