Welcome to ECN!!
I guess that it is purely economics of manufacture, ever tried to strip back one of these cords to fit a new plug on one of these devices?, they are a nuisance and I take it, that you are talking about an appliance that is sourced from China or some other Asian country.
This is what makes them competitively priced, until it comes time to fix it, we have a term over here, NWR (Not Worth Repairing), people think that you are just looking to sell them a new appliance.
Such is our throw-away society!.