Anarcho-capitalism largely depends on a belief that human nature is essentially good, and prone to spontaneous cooperation. It is also heavily dependent on reputation, which scales poorly, or on trustless technologies, which aren't yet mature.

I'm still anarchist in 2018, but I haven't been anywhere near the an-cap territory of it since around 2006. Sticking to a political dogma out in the libertarian hinterlands is really only good for pointlessly arguing with other libertarians on the Internet.

That can be fun sometimes, but it's not as entertaining as it used to be, what with everyone pointing at Twitler and saying "You see? This is exactly as (insert libertarian variant) predicted!"