I agree, both ideas are bad. And I'm inclined to agree with Scandium's assessment that your idea is worse.
A 2.875% mortgage is amazing. Make minimum payments and invest the rest.
As for why not DNP...
1) It's concentrated in energy, communication services, and utilities. I recommend VTI/VXUS, to get the full US market with VTI and the international market with VXUS.
2) It's actively managed. Statistically speaking, only about 20% of actively managed funds in any given year beat their respective market index. It's even rarer for an actively managed fund to consistently beat their respective index.
3) The total expense ratio is 1.60%. That's nuts. With a 6.8% annual return (and it seems you're equating dividends to performance, but that's an entirely different discussion), that means over 25 years you'd only keep 59.2% of the raw returns, and pay 40.8% of the raw return in fees. If you invested that in an index fund with only a 0.1% expense ratio (such as a 50/50 combination of VTI/VXUS), and we assume the same returns, you'd pay only 2.8% of the raw return in fees and keep the other 97.2%.