[1] According to a 1986 article in New York Times, screws on old furniture can be difficult to remove due to rust.
They are often used in flat pack furniture, which is typified by items such as book cases and wall units that come in a package of pre-cut and pre-drilled components ready to assemble by a novice.
Knock-down fasteners can generally be assembled with a single driver, such as a hex key, which may be included in a hardware kit that comes with the product.
Specialist tools and jigs are often required for the repeatable installation of knock-down fasteners (but not for assembly of prefabricated flat-pack furniture), so they tend to be limited to those who are making mass-produced items.
Knock-down fasteners are typically used for carcase joinery; furniture designs using them are usually of frameless construction.