Because lots of people don’t want to go into a job and work with other people. They would rather work by themselves or with their family members.

When you work in an office or at a factory you recognize that some people do way more work than others. If everyone’s getting paid the same then that is extremely demoralizing.

On top of that, you have all the politics and drama of the work place. Just because you succeed in a Marxist revolution doesn’t mean you have eliminated interpersonal conflict forever. Gene Roddenberry tried to portray that in Star Trek and it was laughably unrealistic.

Human beings are innately competitive for social and sexual reasons. That doesn’t go away when you eliminate private ownership of capital. People just find other ways to screw each other over and gain an advantage. Formal power structures get replaced by informal ones.

The deepest reason to want to have your own woodworking business is an overwhelming desire for self-sufficiency. When people have screwed you over and made your life miserable it’s an incredible escape to be able to switch to working for yourself. If you take that outlet away from people you will face violent resistance.