It's kind of true. If someone like myself, Neji, or even yourself have been using Photoshop for years now try to make a tag, I HIGHLY DOUBT there is something that cannot be done with the knowledge that we have in this field.
When I make a sig for example, I imagine it first, then I KNOW how to exactly transform what's in my head into that program, and I presume everyone else who also have been doing this for too long, is able to do the same.
So for instance, when someone say "It's supposed to look that way", or "that's how i wannet it to look" then It's probably how I wannet it to look anyways.
It's just that finding two people with an identical imagination is hard, when you see something you imagine it as something else - in your head - its' the better version.