Another point that's important to raise is that, if you have aspirations for your product to grow in number of users, it also has to grow in diversity of users.

Another point that's important to raise is that, if you have aspirations for your product to grow in number of users, it also has to grow in diversity of users. At some point, the institution as a whole has to gain the ability to design for others or be relegated into a ghetto (cf: Crossing the chasm). Now, a reasonable argument could be made that by the time this happens, it'll be possible to hire talent to help you scale, diversity wise. It's certainly possible but I wouldn't call it easy. OTOH, I thinking baking in the assumption that you-are-not-your-user at the very early stages of the corporate culture makes that transition process significantly easier.