How do you amass power in an anarchist system? In capitalism you generally amass power by amassing capital. What's the equivalent under anarchism?
That said, I agree with your criticism of communism / anarcho-syndacalism: if you remove capitalism, you are moving power into party politics, which creates even greater inequality to what we have today and explains the horror of communism we've seen in the past century.
I don't know why you interpreted my comment as being a criticism of communism or anarcho-syndicalism (it was just a probing question to understand what somebody thought anarchism would look like), and neither does your criticism of those ideologies make much sense. I don't think you actually know what anarcho-syndicalism is if you think it involves party politics.
The destruction of fiat currency wouldn't prevent the accumulation of valuable goods/commodities.