I have owned Glocks for a long time and have talked to allot of range owners these problems you mentioned in one competition don't happen over a full year of shooting all day long.
They all say the same thing "they are used more than any gun and break the list."
Here is how reliable a Glock should be.
I am pretty new to glocks, I have only owned 9 or so over the last 16 years. Never really cared for them or found them particularly more or less reliable than any other Quality Marque. The Primary problem was primarily the magazine for me. I seem to have solved that problem along with Glock and their, I believe, 6th generation magazines. (I was told it was the 6th generation otherwise they could be blowing smoke up my skirt.) For a recent example, I do know my Glock 19 does not like the 5th generation magazines at all. Just plumb refuses to feed from them reliably.
I have not carried a Glock for CCW, and just started competing with one this last summer. I replaced a 1911 in the competition mode, with a Glock 34 just to save money on ammo.
Now excluding the magazines, I have seen Glocks KB, I have seen them shear rails, I have seen them sheer barrel lugs, and most just broke trigger springs. I think they are pretty rugged, but no where near where the kool aid can be found.
I remember when the Ohio State Police were going to dump their Beretta 96's for lack of reliability. They had a shoot off.
IIRC, 15,000 rounds, cleaned every so many etc. They also had a subjective section. All entered weapons were either 40 S&W or 45acp.
The reliability stage was won IN ORDER by: (NUMBER OF ftf ARE APPROX BECAUSE OF MY MEMORY)
SIG 226 40S&W 4 FTF
SIG 229 40S&W 6 FTF
HK USP FULLsize 40S&W SIZE 11 FTF
GLOCK 22 13 FTF
And the list went on. Notable was that everyones 45acps were DNF. Everyones.
Doesn't really matter what you think or your opinion. In real endurance shoots, very few weapons are as reliable as folks think. Even their own guns.
What folks forget, that a hung mag, failure to lock back, that quick tap rack etc.... are all ftf's. Not blaming ammo Malfunctions now. DFO's (dump_______ Operators) matter in competition and real gun fighting too. And under the "gun" doesn't make working your weapon easier either.
I think operator error should count. If you apply the law of large numbers, operator error should be illuminating too. For instance, SIG's reputation for not locking back on the last round, isn't a weapons failure, it is almost exclusively an Operators error related to the position of the the slide lock/release.
If we had a week, we could talk about the problems with the 1911 too. Lots of them to discuss, and a substantial increase in potential operating errors too.
Fact is most folks don't know the weak points of the weapons they carry and shoot. Why because they choose, buy, shoot and justify what ever they have or like. We all do.
Go figure.
Fred