There were some subplots that didn’t end up going anywhere. Some of it is a result of the season compression but other stuff I think they just didn’t know what to do with. The big ones are:
*Mon Mothma, her family, and anything to do with the wedding. The only major thing that affects anything else is Luthen taking out Tay Kolma. The rest is all fluff. Mon already made the “sacrifice” of marrying off her daughter in season 1, we don’t need to see it play out.
*Bail Organa staying on Coruscant. Doesn’t matter at all, he’s teleported to Yavin after the timeskip.
*Wilmon going with Saw to steal special fuel and inhale it for some reason. It seems like it’s going to lead to another bigger mission and like he’s going to join Saw’s faction, and this was a rite of passage. But the next time we see him he’s with the main rebel/Luthen group like nothing happened.
*Similarly it seems like Bix is going to start doing missions in the middle and she’ll have a Bonnie and Clyde thing with Cassian but really they were just taking revenge on the torturer guy. Her worries about killing the innocent soldier guy on their last mission, and her drug problems, don’t go anywhere either. Although it is nice that she’s happy at the end and you can say that that was the point all along.
*On a related note there’s the setup where Lonni and the other ISB guy are going to supervise the other Imperial intelligence branch working with the torturer and making sure they don’t screw it up, which could have been entertaining. But that’s dropped when he’s killed right away. Maybe that was to make it more shocking when Bix takes him out? Who knows.

Overall I still thought it was satisfying and well done and the time skips were useful for getting to the good parts quicker.