You might want to think again on that. This is the same debate that farmers and factory workers had a century ago. Farmer: "We don't need machines because we can't eat them." Mechanic: "With my machine you can produce 100 times as much food." There are still countries in the world where farmers don't use machines, and the people starve.
A factory without accountants goes out of business and makes nothing but debt. When you buy a car, you might think it's made out of mostly steel, or maybe rubber and plastic. As it turns out, GM's largest single supplier is insurance. So what you're really driving around in is a big hunk of insurance with some steel, rubber, and plastic mixed in.
Good observation. If a business is to remain in business, someone has to keep the books. If it were not for the accountants, the factory workers or the engineers would have to take time from what they do best (making or designing things) to keep the books. So the accountants do participate in the creation of wealth.
Likewise, the janitors, the receptionists, the secretaries, and the sales people all participate in the creation of wealth by freeing up the factory workers and the engineers to do the work of production.