But it hasn't. People trying to implement Marx keep getting their movements hijacked by capitalists like Stalin and Xi. Marxists can't defend their societies against capitalists.
Anarchists derive our ideas from 60,000 years of history. We have successful movements to draw our ideas from. We follow the example of actually existing communism.
You're parroting some racist ass noble savage bullshit right now. Tribal societies weren't communist because they were too dumb to create advanced societies. They were communist because they were smart enough to pick the most efficient economic system in the harshest conditions. It wasn't an accident, it was the result of millennia of hard work and careful thought. This work is universally applicable. You just don't want to listen to brown people telling you how to run an economy.