Explicit leadership roles also inevitably result in situations like, "well, they were the best person we had at the time" whereby a very unsuitable leader is kept in power. The worst orgs I've participated in have suffered from this kind of problem.
People only fantasize about flat orgs when theirs is led poorly.
This is a really underrated comment. I was gung ho about weakly-hierarchical organization in the workplace until I worked for a very talented manager with lots of experience who worked hard to facilitate his team, in a company run by a ruthless dictator. One of the most oft-repeated mantras overheard in the army is "Shit rolls downhill" and this guy seemed to concern himself solely with shielding the team from the frequent bloodbaths happening elsewhere in the company while also sweating hard to chase down the things each one of us needed to excel.
Explicit leadership roles also inevitably result in situations like, "well, they were the best person we had at the time" whereby a very unsuitable leader is kept in power. The worst orgs I've participated in have suffered from this kind of problem.
People only fantasize about flat orgs when theirs is led poorly.