But I think there's a big difference between owning your own business (where you make all the big decisions, you dictate the business values, and are directly responsible for the value you add to the world) and doing CRUD for some company whose values you're not necessarily aligned with.
Also, I'm not saying one can't or absolutely shouldn't seek fulfillment in their daily job, I do too; but only to some degree. In my experience It's far too easy (and common) to overly tie one's identity with the job, forfeiting other important sources of fulfillment.
And of course, different people find meaning in different things; what works for me may not work for OP, what works for you may not work for me.