[asianexpress]

If you only have two people, then yes, it would be helpful if both people could understand each other.

However, as you go beyond two people, the situation changes -- perhaps the CEO needs to focus on the business side and doesn't have time for tech.

Perhaps more generally, it's nice to have someone who can speak on both the tech and business sides so that they can act as translator in a way. CEO, CTO, COO, anyone with an understanding of both sides