Therein lies the problem. Apple can't do what Dell does. They don't have the supply chain and they don't have the cash flow to support that. More options=more, smaller orders on parts=more complexity=much higher prices. They can't pick up the 5% of whiners who can't find a Mac that fits their needs without punishing the other customers. So unless you're willing to pay a hefty premium on what are already not-inexpensive computers, that will never work.
What bizarre split? You keep talking about it, but aside from the name, where's the difference? It's not that they have "some old school product line mindset"--it's that they're not a bulk-order heavyweight like Dell. When you switch to a smaller company, you have to give up some of that flexibility in order to stay afloat. They're fully aware of the Dell business model, and it doesn't work for them, so why ask them to use it? Every configuration option is a tremendous weight for Apple, since they have to provide end-to-end support for it. If you want Dell's flexibility, buy a freaking Dell. Even they didn't get to where they are by overstretching their capabilities.