It's true that there's a lot of sitting around waiting for them to get off work, or to upgrade their Tinkering ability, etc. XD

I expect the next step is to start building deathtraps for them and watch them wander around until they die. I found one account online where a guy built a surreal deathtrap of a house and did things like make his Sim terrified of water and place a swimming pool in front of the bathroom.