My son has his own space in the basement of our home. It is a walk-out basement so he can come and go at his leisure. He checks in with me once in a while and we visit about how things are going for both of us but mostly he is on his own. He prepares his own meals when he is home. He's done his own laundry for years. He is responsible to clean up his space and, while it's not like I would do it, it is liveable and not a safety hazard. I don't go to the basement often, except to do laundry.
As a parenting instructor and teacher of children for many years, I know that what I am doing is NOT what I would advise other parents to do. I have told myself the same thing for quite a while. They are his things, not mine. They are in his space, not mine. It doesn't hurt anything to have the clothes in the bags.
Maybe it's that there are very few things that I can do for my son now that he is "grown up." His choices are his own and he will have to live with the consequences, good and bad, of those choices. Gone are the days when he runs to me with all the problems of his life. Maybe doing his laundry is just a way to care for my son. One day all too soon he will move out of my home permanently and I won't be able to do even this for him. It doesn't mean I won't try or I won't be there when he asks. He must live his own life and I'm OK with that. I'm ready for that--most days. Maybe today I just need to be with him in the only way I can--doing his laundry. I'm pretty sure I'll be over it by tomorrow!