> And it’s not all about looks, you know.
You say this, and maybe I'm missing the point of your post, but you continue to describe how this process is entirely about how things look.
Additionally, I have an issue with this:
> Over time, you’ll build up a collection of “liked” work that you can show to any designer to give them a concrete idea of the style you like.
This sounds like a horrible idea. Any decent designer out there knows that Dribbble exists and doesn't need you to point that out to them. They likely have their own "style" (if we're reducing "design" to just aesthetics for the purpose of discussion) and won't like you showing them what "style" you want them to adopt. Their job as a designer is to solve problems, not make things look pretty in Photoshop according to your taste parameters. Everything they produce should adhere to your brand guidelines, but that's it.