Hmm... Yes...
The thing with The Sims 2 was that you couldn't make occult sims in CAS, so you could easily bring them to the base game and lock turning into them in packs.
The two different types of robots, I see the point. Yet even then we would have two different types of aliens: Get to Work's old boring aliens and new pack's new customizable awesome aliens. Not to mention Get to Work already has lost some value after Photography skill was brought into the base game (and some outfits too).
But yeah, Get to Work would benefit from a refresh in my opinion.