The problem is that none of that is apparent to an outsider. You can tell developers that filing radars is important until you're blue in the face, but as long as dealing with Radar from the outside is functionally identical to talking to a wall, you shouldn't be surprised when you get pushback like the parent's.

If you find that "insulting", consider how it feels to be told to go through the work of filing dozens of most-likely-duplicate reports simply because Apple won't deign to allow searching existing reports. Regardless of whatever excuses they give for that, it sends a very clear signal about how Apple values the time of third-party developers.