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I’d tend to chalk that up to user error, if you’re putting enough force on your toilet paper holder to pull it off the wall you’re doing something besides just pulling toilet paper off of it or maybe you installed it with the world’s shittiest drywall anchors
It really kind of depends on the type of anchor and the intended use
The most common little plastic ones that you’re probably picturing are pretty bad in most cases, but some of the heavier duty ones are pretty damn strong if used properly