Hi Don,
Sounds like someone woke up on the wrong side of the bird's nest, judging by the way your feathers are ruffled. The original question was very generic in nature and as such I offered a generalized, non-specific opinion on the subject. But, since you asked a few more detailed questions, I'll indulge your curiosity.
Revolvers are far less particular about the ammunition used in them than autoloaders. This is an irrefutable fact. If you cannot accept this, then read no further as you will learn nothing from this post and will likely find it irritating. Forgive my oversight, I didn't think it would be necessary to point out such a basic truism on a forum for gun-cranks.
I did not miss "a couple of points." Designers of autoloaders have indeed made significant progress in reliability of operation with a wider variety of bullet profiles. Nonetheless, FMJ bullets are the least problematic. Using the word " perceived " does not change nor even mitigate the fact.There is quite a bit of variance from one gun model to the next, and again I point out the vague nature of the original post. For example, 9mm's tend to be more forgiving than .45's due to the geometry of the rounds, but this may be compounded or offset by the make and model of the weapon. I do agree that if a particular gun has been EXTENSIVELY tested with a particular round and has a high rate of reliability with that round then it may reasonably be expected to perform adequately with that round. I thoroughly disagree with the extremely common practice of firing one magazine of "the good stuff" through a gun and declaring it reliable, then shooting nothing but inexpensive "plinking loads" for the next few years while keeping the "defense" loads collecting dust in the nightstand.
I am pleased that you are satisfied with your Glock. They enjoy a good reputation, and having confidence in your choice of defensive weapon is possibly the most important criteria. Personally, no Glock would be my choice for personal defense, nor would any 9mm but we each have our tastes, opinions, and preferences.
"Oh yes , you raise the issue of shifting point of aim. While this may make a difference at 50 yards while hunting, it is a non-issue when a handgun is used at defensive distances." and "Again, who cares if your point of impact shifts up or down 1/2 inch at 20 ft??" First, the POI can vary far more than 1/2 in at 20 ft, and is not limited to the vertical plane. I guess if your definition of "defensive distances" is point blank, then it is a trivial matter indeed. It is somewhat ironic that you specified 50 yards as "hunting" distance, since the Marine Corps considers it pistol range. Forgive me, but I am getting a mental picture of you as one of "those guys" I see at the pistol range...the guy with all the right gear, custom gun, yellow glasses, etc...running magazine after magazine of double and triple taps through his Glock 9mm at a life sized silhouette less than 10 ft in front of him - probably in a Weaver stance.
"Do you think Les Baer knew what kind of ammo I was going to use when they regulated the sights?? Of course not." I would not presume to speak for the folks at Les Baer, but it is the commonly accepted practice to try a variety of ammunition from a fixed sight gun to see what works best. It is not that the gun shoots accurately with all ammo...it is the shooter's responsibility to find what works well in their gun. But I would be tempted to suspect that Les Baer recommends a certain ammunition profile for optimun accuracy in their fixed sight models.
No doubt not the reply you would have preferred, but I have tried to address some of your questions without getting too long winded nor technical.