It doesn't make sense for everyone to do the same types of work.

Different people should do different work and then use money to exchange their own efforts for the efforts of others. That's what money is for: storing up the time and energy expended during work, so that it can be traded.

As soon as you specialize and do the same thing over and over, it becomes work, because you will become so efficient that other people will pay you for it, rather than doing it themselves.

I like to work with computers and would fiddle around with them, as a hobby. I could not ever become efficient with it, if I were also planting a garden. But, if I am not planting a garden, WHAT DO I EAT? I have to eat the produce from someone else's garden. Which means someone else has to produce a surplus of produce. At that point, we are both working.