I think an overarching issue is that the goals of FB developers are different from the goals of FB itself. As a result, FB is keenly focused on keeping its fee

I think an overarching issue is that the goals of FB developers are different from the goals of FB itself. As a result, FB is keenly focused on keeping its feed and request channels relevant and trimmed down, while developers would rather use the channel to blast as many people as possible. That's also why Facebook is fine with breaking stuff for its developers if it makes the customer experience better.