This example is a bit silly, though, because it loses two of the main desiderata of 2PAs: First, we've lost dominance: A bidder's willingness to bid as described in the bunching regions relies on the other bidder's complementary weird behavior there.

Second, we've lost some simplicity: Whereas the auction format only amounts to setting a reserve price, the desired equilibrium now depends in a detailed way on the type distributions.