I feel like when a lot of things are released at once it really spikes players interest in the game. I know a lot of players are having trouble finding something to do right now at lvl 19. When you can focus all your resources on 1 small update, its over quickly but when there are a few new things to do its takes longer.
Honestly I prefer many small updates than 1 big. This way You don't have to stop in place and wait for new big update. And we are not ready for lvl20... we don't have even enough lvl16 not mention lvl19s