"Edge cases?" You mean like Iraq I, Iraq II, Afghanistan, Libya, and the current trouble in the Levant? Name one post-Vietnam conflict the West has been in that the F-35's stealth and electronics would have been useful. These are the types of conflicts theoreticians expect us to be engaged in the foreseeable future. Not a modern Soviet Union, which the F-35 is aimed at. So, by all means, include the type of air defenses that were seen in these conflicts.
I'm not against the capabilities the F-35 is supposed to bring to the table, minus the jack-of-all-trades-master-of-none bullshit of trying to build a single aircraft to satisfy all niches of not just the U.S. Air Force and Navy, the needs of every other possible purchaser. Having a stealthy aircraft capable of delivering on-target in a peer environment is useful, but not in the same numbers we need a robust system like the A-10. Plus, no one says we can't do another upgrade block on the A-10, or build new airframes. We needn't have only one tool in our kit, we need the proper tool for the job and the correct number of each.