If you leave clothes in the dryer, you'll be able to remove them at any time to reset the timer.
Yes, but in my game,
sometimes, if I leave clothes in the dryer, the timer never runs out, so it never needs to be reset. At other times, removing clothes from the dryer does absolutely nothing. When this happens, I've even tried letting the laundry build up again for a few days, waiting until the hamper is full, but I still don't get the moodlets, after removing clothes from the dryer or line, when the sims sleep or change. Also, just to make sure I'm thoroughly confused, some sims can go an unusually long time w/o doing laundry and keep the moodlets.
I think Dienvae may be on to something in that most of my households that have laundry issues have more than one sim, so more than one hamper. Except, the current fambly I'm playing has 3 sims, 2 hampers, and 0 problems. Also, the first fambly where I noticed an issue had only 2 sims and 1 hamper. So, basically, it's random as fuck.
If it matters, the mods I'm using are: nointro, same energy gain for beds, stuff on fridge, twoftmama's teen woohoo, and awesomemod. All are up to date and working properly. I could try removing mods for testing, but as the issue is so random, I'm not sure what good that would do.