Sales should precede product. Our approach was to build prototypes, then go look for clients for them. With an excessively engineering centric approach, many of us considered presenting a deck with something we didn’t still actually have to be intellectually dishonest, so we built everything in order to show it. That was expensive, slow, and lead to a huge amount of wasted prototypes. The reality is that it is the only way to actually approach the market is to pre-sell the idea.
I was at a company many years ago where a particular employee was extremely talented in his particular field but an absolute nightmare to work with. He needed to go. He was finally let go but it was years too late and significant damage had already been done. Don’t let that happen.