I'm not sure why we require 1,500 words to convey the very basic idea that you shouldn't build a product in a vacuum. This entire article could fit in a tweet:

I'm not sure why we require 1,500 words to convey the very basic idea that you shouldn't build a product in a vacuum. This entire article could fit in a tweet: Show it to the people you want to sell it to as you build it, and start building a mailing list before launch.