I don't think that's really fair? Episode 8 was where we learned that Cobel was the one personally responsible for designing most of the tech used for the severance process (if not all of it)! It's the episode that explains why she finally turned her back on Lumon to help Mark.An entire episode dedicated to Cobel finding an old notebook? That episode had so much potential but it ended up being a huge waste of time. For anyone who has not seen S2 yet, you can skip episode 8 and you will not have missed a single plot point.
Could they have communicated it without using a whole episode? Yeah, probably. But it definitely helped viewers learn a LOT more about Cobel's upbringing/background, so she's not just this mysterious character who was somehow given a high-ranking position in Lumon despite not being part of the Eagan family.