Doing a set of tasks over and over have never been the game's strength in my opinion, I think it instead comes from being able to do things differently by using different sims, unlocking new ways to play and build what you want to accomplish it.
For example the things we could craft in the Scientist career, the research and debate skill and the robotics skill in Discover University. As long as we have things like that I think playing sims at a workplace still works.
But when we can't do more than some simple tasks and we are not able to change things around (like not allowing us to build) or when the new game features doesn't change the way we can play the game then things get repetitive very fast.
