That's the definition of the previous animal in the list: the boss says so, others don't need to bother themselves discussing.

This is a valid way to make decisions, but it does away with any upsides of discussing things or basing decisions on data.

Another problem is when a team of the "big guys" actually discusses stuff, and someone co-opted into the discussion does not feel like adding a word, "nobody will listen anyway". That person could be e.g. a subject matter expert and potentially offer valuable, decision-changing input, if made to participate. It takes a conscious effort to make such people feel welcome and share their opinion — which was the very reason to invite them to a meeting.