They used do monthly updates until they stopped due to people spamming which a certain update would be released in the month or people got scared that it would not show up. For example, July 2017 was the 1st anniversary and 3.0 update. Once the post came up, people wanted to know when exactly the events showed up. This might be the reason why they stopped releasing updates ahead of time since some people can't chill. To me, that was an attempt to be transparent but people demand more in which Oasis might not be able to in case something was delayed. Who knows perhaps the 3.0 update was suppose the happen in the 1st week of July but they had to move it to the 4th week.