Some speculation on this comic. I don’t think the PBF creator has ever officially commented on it, but it seems probable:

As far as I can tell, Catch Phrase was a meta-commentary on how he saw the role of himself and his comics in the public’s eye. Basically, he was tired of feeling like he “had to” make a funny comic, and he burned out. Now that he’s (apparently) bounced back from burnout, he replaced Catch Phrase with something new, and less pointed and angsty, to signify that he’s not done with comics.