The problem is this: people associate graphic designers with the tools they use. And that devalues the designer (and Design at large). Just because you can use Photoshop and mash pixels, doesn’t mean you’re a designer.
Quality control and creativity can be at odds. So when’s the best time to edit? It’s best to edit as you go and give yourself time for QC near the end.
Defining your brand helps focus your business. Branding is the story of you and helps you connect with your customers.