I can totally understand why they would want to delay some releases into 2018 seeing how Communities and SMTs may feed into each other, and also how fixing the Account creation process is vital before attempting to go viral.
Great review as well. I think all there's left to do now is continue building the most fruitful communities on the platform whilst also buckling up for high velocities coming soon :)
Yes, it makes a lot of sense. The point, though, is that Communities and account creation should have happened in 2017.