I am not sure this is true to the extent that people want it to be. You see the main benefits of diversity when groups of users use products in different ways depending on who they are. However, a large majority of products are used the same way by all people (almost all b2b products / services that I can think of and many if not most consumer products / services), so for those products I'm not sure it matters who your creators or developers are as long as they understand the industry they are making products for and they talk to users.

I can see the benefit in having a diverse workforce when it comes to discovering new markets or uses for technologies or products, but I think it would be far more important to shoot for having people from a variety of industries and backgrounds on your team to spot these opportunities as opposed to trying to preferentially hire minorities, women, parents, the elderly, lgbt, etc regardless of their backgrounds.

That being said, I do agree that communicating cultural values, mission, and expectations regularly is very, very important as many people have a suboptimal idea of how their work meshes with overall goals of the organization and what is expected of them. Regularly checking in with direct reports can help them internalize these ideas better.