Tech entrepreneurs: How important is your skill at designing and prototyping your product(s)?

Success has a lot to do with your sense of being Find out how to train yourself to make money and stay in tune with your mind, body and soul

A key lesson I'm taking from talking with tech entrepreneurs on how they started and developed their company is the importance of iterative prototyping, which involves being good at design.

As an entry-level engineer, I've taken up more design projects at my job to improve my design and prototyping skills. Would you agree/disagree that improving this skill will drive future success for my eventual startup? Is there a better way to improve at this skill or is this skill not important for your success?

EDIT: I think it'd also be interesting to hear entrepreneurs who don't design and prototype their own product and how they are still successful.

P.S: If you are interested in making money on-line, there are many avenues you can explore. Click here to get my step by step guide on how to this. I break down all the details for you and give you some useful resources and tools