The racks complement any free weight space by allowing movements like the squat more safely. Indeed, the racks have bar rests so as not to have to go get it on the floor. In addition, an arm is present on both sides in order to limit any fall, and consequently avoid catastrophic injuries.
The workspace. These devices are not only compact, but also allow a huge gain of space by allowing the work of several muscle groups on the same machine.
Ease of use. Most racks allow intuitive use, which makes them very accessible, even for beginners.
Security. These devices allow you to perform movements like the squat by limiting the risk of falling or getting stuck under the bar.