Suppose that there is a regency council of seven noblemen. If 6 of them sign off something, it's the same as a royal writ.
I had a post that included an element of this, but don't worry about that, this post is more about the general thing.
I just realized that if all seven come from different families, even if they aren't rivals with each other, how is anything going to get done if you need 6 of 7 to get anything done? In my other post, I hand waved it as "well, the agreed on something" but in the general case, wouldn't such a regency council be paralyzed into inaction by its design?