I just played a goofball Sim yesterday. I took out the trait overhaul mod I have so I could see it as the game intended. It was Duane Talla and, honestly, the new coding seemed to fit. He didn't prank the toilets, but he was using mischief interactions right and left.
I can see that this might take some getting used to, but I like the change and hope it isn't nerfed. I think it would make sense to not have Sims prank their own toilets, however, but otherwise keep it as is. Possibly using more funny interactions could be added also.