I would argue the opposite, you can have the best product in the world but if you don't know how to get it in front of people who need it, who cares.

Make an MVP and try your best to sell it, if you cant sell the MVP its probably not worth it to continue to work on the product.

It's important to validate your ideas before going head first into something that nobody really needs/wants

Listen to this. Sales and marketing mean nothing without a product.

Focus on creating value. You use this value to market and sell.

Jobs/pains/gains is my favourite way of thinking about this, but everyone has their pet frameworks.

Any suggestions?