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It's not about the $/WAR, it's about the $/runs. If you look at Morales without the DH adjustment, he's right in line with the $/runs @1/14. If you let Morales leave you need an upgrade that will exceed his run total at DH while costing less.
And then you'll see there aren't that many better options on the market.
You have to fill the DH slot with someone. Everyone playing DH will suffer from positional adjustments. Therefore, there is a problem with the $/WAR paradigm.