Mechanical Human augmentations became popular in the late 21st century when their production, size and weight became reasonable enough to become a commercial success. This popularity lasted only for a few decades as more advanced Bio Augmentations and Gene Engineering replaced the grotescue mechanical ones.
Nowadays only the poor and the desperate rely on mechanical augmentations as they are seen as unnatural and ugly.
Probably the only mechanical augmentations used widely, are the ones put inside the head. Plug-ins allowing direct access to neural resources and computer interfaces are common for hardcore coders and data engineers. Despite their usefulness, even these implants carry the stigma of not being 100 % organic. Many computer and data professionals stick with removable neural helmets and nanowire plug-ins to allow direct access to their instruments.