The key point, ORIGINALLY, was that there were IMPORT restrictions. They can be worked around, as someone else said. ( have a CZ-85 Combat, which doesn't have a firing pin block, and I was told that that FPB point deficit caused them to import the gun with a click adjustable rear sight to somewhat offset the points lost. The point system might also explain why the Springfield XDs have a grip safety: import points.)
Comparing the original Glock in .380 to the LCP (in .380), for example, is an inappropriate comparison -- as the LCP isn't imported.
I got the following information off the internet some time ago, and I don't whether these import restrictions have been amended in any way.
The point system that controls handgun imports was originally intended to make the import of "Saturday Night Specials" very difficult, and a total of 75 points were required to get a gun past import restrictions, and many .22s couldn't do it. (In the case of a .380 Glock, you'd see that there was a 13 difference between 9mm and .380.) I suspect, but am not sure, that the Glock would not be a locked-breech system system, and that's another -5 points.
Length: for each 1/4" over 6" - 1
Forged steel frame - 15
Forged HTS alloy frame - 20
Unloaded weight w/mag (per oz.) - 1
.22 short and .25 auto - 0
.22 LR and 7.65mm to .380 auto - 3
9mm parabellum and over - 10
Locked breech mechanism - 5
Loaded chamber indicator - 5
Grip safety - 3
Magazine safety - 5
Firing pin block or lock - 10
External hammer - 2
Double action - 10
Drift adjustable target sight - 5
Click adjustable target sight - 10
Target grips - 5
Target trigger - 2