Gotta love an article that starts out with "I'm not qualified in any specific way to make the general assertions I'm about to." I also think he's flat-out wrong to condemn revolvers as a SD/combat weapon. I'd imagine that one of the reasons (as you mention) some specops carry revolvers is because they don't jam. Since there is no feeding mechanism (the rounds remain locked in place until fired), there can be no feeding errors. The article isn't bad, it's just a very strongly-worded opinion piece from somebody who gives us no compelling reason to trust his opinion.
But I'm way off topic, as usual.
I'm a pistol fan through and through. The more variety we have in that regard the better. I don't mind if there are wildly impractical target/hunting handguns, so long as the practical ones are at least equally effective (preferably moreso).
I tend to think of shotguns and ARs as more utilitarian than stylish, so I'm not quite as picky about variety there. Also, a vast number of ARs out there are based on the same few platforms anyway. As for SMGs, well, they pretty much killed it for me when they made them dual-wield, so I don't really have a preference.