Again, it's not about the users in this thread. It's about the Windows Phone 8 operating system and it's market share. We, as a community, are fans of a phone OS that is currently fighting for it's life. WP8 is not only up against Android & iOS - but when a carrier refuses to update the flagship Microsoft/Nokia flagship phone in the US, WP8 is up against Verizon too.
WP8/Black to WP8.1/Cyan is a major jump in performance and features. It puts Windows Phones on par, if not ahead, of Android and iOS. When Verizon doesn't release this upgrade, it fundamentally stifles the growth of an already struggling OS.
Sure, you and I can update to WP8.1 using developer preview. Most people commenting in this thread have. But what about those who are won't download the developer preview? What about those who are shopping around for a phone right now? All they see is an Icon running WP8. People like my sister, or my friends that want to run stock to cover their butts. People who are business users who can't put developer previews on their devices.
There are so many reasons that Verizon's current practices are hurting WP8. That's why we're angry.