Nah.
Look, they get, what, 10 episodes a year? Are they all going to be fanservice?
Ooh, they HAVE to do a Meeseeks episode! Sure, he was a partially funny one-off gag on a show built out of one-off gags, but, yay meeseeks!!! Callback to something I remember!!
And a Mr Poopybutthole episode! For the same reason.
And another episode of the Vindicators! Noobnoob's revenge!
And another intergalactic cable clip show (because the writers need a week off after only doing 10 episodes a year)! Or, maybe Summer's Mind Blowers next time!
And we need to go to the Citadel of Ricks, and find out what is going on with Evil Morty!
And Mr Gearhead has to come back too!
And we have to find out what happened with Birdperson!
OK, there's 7 episodes. Now they do a Morty/Jessica story, a Summer adventure with Rick, and, I dunno, Rick turns himself into a gourd of some sort next time. Done. There's your 10 episodes, which the drooling fans will give 10/10 ratings to on the imdb until their fingers bleed. They couldn't be happier (as long as no women get writing credits, apparently).
How does it take them a year, year-and-a-half to work these out? It's just copy-paste from what they've already done.