Why are micro pistols so popular?

Are micro-9's overrated?

Often referred to as “micro 9’s”, a smaller than sub-compact 9mm pistol for “deep concealment” is what I am referring to. There are some pistols in 380 acp, and other smaller calibers, that also fit into this category. There are potentially six different classes of semi-auto handguns: competition, full size, compact, sub-compact, micro, and pocket.

My…