The difficult step is getting around or past the concept of private property.
Except for altruism, how do we effectively remove “property” from people who create it but don’t need it. Most arguments I have seen or read end up back at basic capitalism.
The ideal that everyone would be altruistic and give up all superfluous labor seems far fetched.
Most leftists distinguish between personal property and private property. You get to own your favorite mug, your toothbrush, and even your house, but not a company that controls the labor of others, or someone else’s house. I don’t know where you’ve come across these arguments you’ve read, but, again, there are literally centuries of socialist scholarship, none of which is just advocating for capitalism with some window dressing. There are many “socialism 101” lists out there of how you can get started. I seriously recommend that you give it a shot. It’s actually really fun to read smart and imaginative people trying to make an outline for a new, better world.