Yes they were developed in response to a NATO requirement but lots of requirements and requests for proposals end with nothing in service. You might see handguns chambered in "PDW" high velocity rounds like the FN Five-Seven but all the PDW's are significantly bigger and heavier than the handguns they were meant to replace and they will always be more expensive, size and capability dictates that. On an army wide scale convenience and ability to perform the primary task will outweigh sightly more capacity if things go wrong.
At the end of the day if an air defence battery gets attacked by a Spetsnaz platoon they're buggered no matter what their side arm is.
At the end of the day if an air defence battery gets attacked by a Spetsnaz platoon they're buggered no matter what their side arm is.