Re: Sims shower constantly...
I don't remember if I saw an increase in showering sims after that update, but I did notice that some of my sims did not want to finish the task of showering, even when I had instructed them to. They got in, and then a second or two later they got out.
On A side note:
Another thing I seemed to notice after the Eco update was an increase in sims walking through walls and a general almost acting like a ghost. By "ghost" I mean it as one moment they are in one spot and the next teleporting (for lack of a better word) to another place before suddenly returning to the original spot. I mean there has always been the occasional sim walking through a wall but this was a different level of occurrence.
I don't know if the original poster of this post has encountered the things I mentioned, but thought to mention them anyway since I only noticed them after the same update originally mentioned.
Edited to add: I use not any mods or cc