[FarCenter]

Smith machines are designed to allow gym-goers to lift barbells without a spotter.

Doesn't appear to be true.

Seated Smith Machine Shoulder Press: Muscles Worked & Technique

https://www.strengthlog.com/seated-smith-machine-shoulder-press/

[freepertoo]

Pretty worthless machine.

[SauronOfMordor]

My gym has something similar, but it has a safety block which you can set to prevent the weight from lowering past a given point.