A product category is rarely useless by itself. The problem is buying without a clear task, storage space or realistic habit of using the item.
Single-purpose kitchen gadgets
A gadget that performs one rare task often ends up in the back of a cabinet. Estimate how often you will truly use it and whether an existing tool already does the job.
Complicated storage systems
Organizers work when they match a real set of items and a specific cabinet. Buying a large system “just in case” can create another collection that itself needs storage.
Cheap single-function robots
A low-cost automatic device may be weak, noisy or annoying to maintain. Read reviews about everyday use, consumables and cleaning, not just the star rating.
Decor without a specific place
If you cannot name the shelf or wall where an item will go, it may become visual clutter. Measure the space first and imagine it inside the existing room.
Appliances that are difficult to clean
The more parts an appliance requires you to wash after every use, the less often it may leave the cupboard. Check the cleaning procedure and replacement parts before buying.
Bottom line
Keep the solution simple: start with the most likely cause, change one factor at a time, and observe the result. That makes it much easier to identify what actually works in your situation.