The bosses are not "gun guys" so when the sight would break they would just say "well just replace it with the same thing, why are we gonna pay to upgrade the gun"
They could never imagine doing one handed manipulations using the sights or similar..... (where is the "mind blown" icon,that is very fitting for their reaction to seeing/ being shown one handed manipulations)
As we know, when dealing with people that are not interested in guns, its difficult to change their minds once they are made up, IE "Why do we need to pay for new sights when those plastic ones that come with the Glocks work?"