You conveniently left out the feedback issue and the agreement issue. Most people don't know how their devices work. The BEST most people will be able to do (unless they are developers) is give UI/UX feedback. That is useful, but more useful from the public perspective. Apple is also likely getting ridiculous feedback from average users on the dev beta with nothing more than "It's broken! FIX IT!" Developers give useful detailed feedback about the underlying APIs, which is infinitely more useful because a lot of those affect the UI/UX. The agreement is important as well. If you are installing the beta using another profile other than your own, that is technically fraud. If anything goes wrong with your device, Apple is in no way obligated to help you. It seems to me that they are taking action now in an attempt to clean out the clutter.