I'm guessing that they bet the farm on Hillary winning the presidential election when they were formulating the season's arc, and were thrown when that didn't happen.
So from about halfway through, they've had to take all the plot threads they'd created and try and fashion them into a satisfying conclusion.
Which evidently they didn't manage to do.
This final episode's title - "The End Of Serialization As We Know It" - suggests that they've realised the problems with a long-form approach, or simply just got bored of it.
Hopefully next season will see a return to more self-contained individual stories where the humour stops playing second fiddle to plot development.