> I was pretty sure I knew what most of the problems were, so I got in touch with the developers, and everything got sorted out in a few days (they were already aware of some issues).

Yeah but like, I get that startups are better at listening to customers and adjusting quickly.

But I can confidently say.. if John Carmack himself legit sent me an email pointing out some problem with something I made. You bet your ass I would respond and listen to what was on his mind. Regardless of the size of my company and the amount of work on my plate :p