If you’ve ever been to Paris (or anywhere else) with 50 people you will know that the bigger the group the harder it is to get anything done or to get anywhere.
The length of time it takes for the group to make a decision increases drastically with the number of people in the group.
This is similar to the number of features in a product. The more features, the harder it is to get anything done (see my previous post on the subject).
Sometimes you see a professional tour group leader (you know, the ones waving an umbrella). They massively reduce the “slow-motion” effect of travelling in a group. The product equivalent is the product owner. Every big group of features needs one!