I recognize this fight. Person A has a system, person B finds a problem in it. Now, is it a "real" problem? Emotions run high, on both sides, and I've been on

I recognize this fight. Person A has a system, person B finds a problem in it. Now, is it a "real" problem? Emotions run high, on both sides, and I've been on both sides of it at various points in my life. I recognize the patterns of the bad arguments made by both sides (by A: "of course you don't do that," "this requires something else bad to happen," "that's a problem with bad coders", "you are an idiot"; and by B: "every potential issue is worth full attention," "you should always stop your developers from breaking things," "you can't fix things with obscurity!!!1," "you'll be sorry", "you are an idiot.").