As a startup, the key question that helps prioritize between everything you mentioned is "what activities are hygiene activities, versus what are growth enhancers?". Defining your customer, gathering feedback, iterating on product and packaging all fall under hygiene activities. Meaning-if you dont get them right they will hurt your ability to grow. Pricing the product right and the rest of biz dev, marketing and sales activities are focused on enhancing growth. In a startup, the center of gravity for the hygiene activity is the product team (of course this depends on the type of startups). Thus, the job of the non product folks is getting the product found and getting folks to use the product.
