Anarchism is a spectrum so there's considerable disagreement over how the desirable state of affairs looks like, exactly. All anarchists would agree that you want to get rid of any kind of hierarchical power arrangements where possible, but the vast majority would also agree that it is not always possible, and so the realistic goal is the one where they are minimized. But that invites the question of what such a viable minimum state of organization might be, and different people have different answers to that.
I'd say that the most well-developed concrete platform in this sense is Murray Bookchin's "libertarian municipalism", although that is arguably too organized to be properly referred to as anarchism (Bookchin himself, although he used to be an anarchist, dropped the label eventually). But, even so, it's much closer to an anarchist utopia than any state-centric model. And it actually has some practical successes on the ground in Rojava, although the jury is still out on whether it can hold long term.
I'd say that the most well-developed concrete platform in this sense is Murray Bookchin's "libertarian municipalism", although that is arguably too organized to be properly referred to as anarchism (Bookchin himself, although he used to be an anarchist, dropped the label eventually). But, even so, it's much closer to an anarchist utopia than any state-centric model. And it actually has some practical successes on the ground in Rojava, although the jury is still out on whether it can hold long term.