BB is working very hard to make this a single player game.
Used to be you needed others to swap buffs - now we have so many new and more availability of old buffs swapping is completely optional.
New more effective buildings and quantity of old buildings mean there is no more trade for resources needed.
Most of new adventures are single player - probably because they are fighting lootspots.
Hardly any player interaction needed anymore.
This is a social game that they are effectively taking the social out of.
As a single player game this is not so good. No reason to stick around if they succeed.