Accounting, finance and operations have nothing to do with "doing business" in any meaningful way.

They are necessary yes, so is cleaning, your systemadministration etc.

You are not learning how to run a business successfully by learning that.

But the big difference is that to be good at business you have to do business. You can't look it up in a book. With engineering your more or less can.

So unless you are a hired gun working inside a proven industry for a company the MBA is pretty much worthless. The engineer on the other hand seldom is.