@ Nomad,
All facts for which I'm aware. I'm speaking factually generically here, versus writing a historical record of every gun ever designed or produced.
Having actually SERVED in the SOF community and seeing Glocks issued and carried to 18 Series men, I'm well aware that the G19 was (after my service) adopted by some of those elite communities to replace the P226. We had G19s and Sigs M11s (and some others) in our inventory, which I personally held or saw.
[You tout reading comprehension - look at the list I wrote and you will find the Glock 19 and Sig P226 and P229 (basically an M11) referenced as top tier guns.]
Ironic you mention the Ruger, as I recently bought two and actually have an unloaded Ruger P95 sitting on my desk (I was recently cleaning it). My writing was, again, generic and speaking in reference to the "best combat handguns" ever made. It was not an inventory of every gun ever made with every feature ever designed.
Yup, you are correct that the P95 has a ambi push button mag release. Certainly ahead of the curve for its era, and a good firearm, it would not make my cut for a top tier handgun. There's lots of heel mag release guns too which are inherently ambi, but those also didn't make my list so I wasn't referring to every gun ever made. We could probably find other obscure guns that had innovations adopted later on, but the guns were never widely adopted. The Ruger P series has a cult following who adore it from a bargain handgun perspective. I'm unaware of any major relevant police force or military who adopted the Ruger P series. Nor would it matter. It's chunky, ugly, clunky, with a wobbly trigger which inexplicably remains in place, backwards safety/decocker, and the biggest lure is that it's an inexpensive firearm that fires reliably but is otherwise unimpressive.
Edited: Just did some brief looking and it appears the P85 was briefly adopted by two US police departments (San Diego and Wisconsin) and the Turkish pollice. I see no adoption by any military. Maybe it has been. But this is not a very impressive list of adopted users.
If I had to make a "best combat handgun" list by gun make and models, I doubt any of these Ruger P Series would be in my top 30. Hence, the lack of reference. I was plainly talking about the main designs.
I will add that while the XD didn't make my cut, it also has been designed with a ambi-push button. It's a better pistol than the Rugers, but still not making my cut.
[You tout reading comprehension - try re-reading what I wrote and digesting it, rather than just going on auto pilot to attempt to pick apart my statements without applying any measurable comprehending of the overall statements.]
This is or should be clear and obvious to anyone with scant knowledge of guns who might be reading this.
As for it being "foolish" to cross train, I fundamentally disagree. I believe cross training on different weapons is important and I'm confident in my ability to mentally know the gun and condition it's in if I have to use it.