If anything, I feel I'd be adding weight to the aircraft unnecessarily. Every ounce counts.
DJI has a slew of about 700 engineers (Desing - Electrical - Mechanical to mention a few), dedicated to the development and testing of new designs. It would not surprise me if at one point in the early stages of the design of the Phantom metal quick release was considered an option. Perhaps during testing it was discovered that "metal" quick release locks adds more weight resulting in more battery consumption = less flight time.
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View attachment 68343 I found these on Standard-Tec.com. Anyone use them? Experiences? They are for the P1,2,3 so they can accept the P4 blades but the locks should work the same on the P4 I would think. They are also made from metal so they might not be as fragile as the stock plastics