There should be an economic system set up where all workers get all the fruit of their labor rather than a fraction of it. Communism failed, but there has got to be another way.
Be careful what you wish for. Risk is important, and if the "fruit" is zero, that's undesirable, too. We're seeing this in a microcosm of the "gig economy" with Uber pushing risk (and other externalities) onto drivers.
I believe that was part of the parent's point about running a business and "hassle". I think it's debatable whether that necessarily costs the vast majority of labor's output, as the parent contends, but I doubt it can cost zero, as you contend.
I'm ignoring capital (tools or even borrowing money) on purpose, in order to avoid the communism tangent.