Because the game isn't finished and we're basically beta testing everything for them. We've already lost our sense of a first time experience with this game, and now its time for us to actually start making progress with content
This is a big pet peeve of mine with developers and patch notes. Please don't do patch notes ambiguous like this. Be straight forward with what you've changed/added to the game. It leads to quicker feedback and better knowledge of how the game is changing.