-A proprietary rail is plain stupid. They have resolved this with newer models but any duty gun without a standard 1913 rail is never a good thing in my opinion
Thing to keep in mind is there was no proprietary rail when the thing came out.
Now, should they have updated it over the years? In my opinion yes, though I don't know how much they would have had to modify their machining to do so. You can get adapters. I know it's stupid that you need to go that route, but at least it's an option I guess.