I think a major problem with decentralizing too much is that basic goods that the modern world needs, like artificial fertilizers and computer chips cant be produced or if they can be produced they cant be made in large quantities. What I understand anarchist communism to be is many small communities of people that collectively grow their own food and make their own medicines, without much large scale trade. With libertarian socialism and cooperatives there’s still the issues that if the workers own the factories they aren’t going to be incentivized to take risks with the company, the average worker has no idea about macro-economics and how to run the business, and they also wont want to lower their wages if its necessary (like if the company is doing poorly or if there needs to be additional financial motivation for low preforming workers - obviously that can get out of hand but some of it makes sense). To somewhat even out the wealth gap I think higher taxes on the wealthy and more rights for unions is pretty much all that is needed.