Hey there. Here are answers to some of your questions: 2. Sometimes the automated systems do subscriber purges to ensure inactive accounts are taken care of. (1/2)
3. YouTube Designers are always experimenting with ways to improve the experience and looks like you're part of some of those experiments. We recommend submitting your comments via the official Send Feedback tool, here are the steps: http://yt.be/help/feedback (2/2)