There is a reason the VAST majority of police departments use it.
And the reason that you cite is GLOCK.
..read the history of Glock, the .40 and law enforcement.
It was a business decision by Glock that gave the .40 a foothold in law enforcement and it's instant rise to stardom. Law enforcement agencies were disenchanted with the 9mm of the time and were searching for an option that Glock gave them(even before S&W got theirs to market) at a ridiculously cheap price. And for the public, being chambered in the Glock gave the .40 instant credibility as opposed to cartridges in the past having to earn their stripes. With that said, I do not own a .40, but I have no issue with it and it is a capable round.