> It's because engineers will build what engineers want rather than what the customer wants.

I’m not sure you can generalize like this. Do the engineers have RSUs or financial incentives where they do better if the firm does better? I’d argue they’d care more then. Also, a lot of engineers intentionally chose to work in market segments they’re passionate about. I’ve been at the same company for over 13 years. I could likely make more elsewhere but I find the domain I work in quite rewarding and interesting.