I've been pointing out that anarchists have not managed to put their ideas into practice on any appreciable scale while Marxists have done this. Ultimately, what I'm telling you is that anarchists need to show how they can actually make their ideas work and withstand the challenges that they face in the real world. This is a problem that anarchists have not been able to solve in my view.

You say that it's the fault of Bolsheviks that anarchists didn't get their way in USSR, but there's no reason to believe that anarchists would've fared any better against the capitalist invasion that followed in 1918, or against the nazis a couple of decades later. In fact, the centralization of power that you decried was ultimately what allowed USSR to rapidly industrialize and come out victorious in WW2.

Meanwhile, I completely agree that the socialist projects that Marxists managed to build are not without their own problems. Yet, I think they are a strict improvement over capitalism as imperfect as they may be. My view is that the threat of fascism is very real and that it grows by the day, and in face of that the left should focus on using tools that have been proven to defeat fascism in the past.