Fashiontern - I can't speak for Jenni, but I will speculate. Sometimes excess belongings, even if an item has been useful or may be useful in the future, feels like mental clutter, and too much of it is unsettling. Order in ones surroundings (variable from person to person) can bring peace of mind and relaxation.
If someone chooses to get rid of old belongings and brings in new belongings in their place, it is often because they are expecting the new belongings to suit their needs better and move them toward their updated goals. Of course one can argue if there is space that the potential item should be kept, or that the churn of bringing in something new when something old will suffice is wasteful. Jenni, as well as others, may have competing fashion, comfort, consumption, and financial goals. On top of that, how we view ourselves and how we want to present ourselves adds an emotional element that cannot be discounted.
