Great post, OP.
To me, while Family Guy is an entirely different show that it was in the beginning, I think the change was necessary in order to appease the new audience the show keeps bringing in. The loose continuity in the show is bothersome, but continuity has never been the show's strong point (Meg being a complete friendless loser one episode and then having a group of friends the next for example).
As for the characters, Stewie's transformation, IMO, was needed because it would just get old after awhile. This Stewie is just as funny. Meg definitively needs work besides just making her the show's punching bag because that schtick has gotten old and I feel like they're wasting Mila Kunis's time with a direction-less character.
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