Purely my understanding, but I think that a bullpup has two generally desirable characteristics: one is handling, the other is the ability to maintain muzzle velocity over a SBR barrel, regardless of bullet weight. I think that we can agree that, IF these goals are achieved, that is generally desirable. Your point about what spec ops personnel choose to use is well taken. Not nearly that I’m that kind of warrior, but that’s why I’m perfectly comfortable with an SBR or a 16" carbine.
But, I think with the fact we're all (or mostly all) civilians, other factors might come into play. Some have mentioned being able to more easily exit a vehicle because of the bullpup's short length. Or, for people of smaller stature or fairer gender, maybe having the weight of the gun held in closer to the body, giving them greater control over handling and with less fatigue, are both traits that might be called desirable for civilians in a way that maybe don’t matter as much to front line infantry or spec ops troops. Some of that can be solved by having a weapon with a folding stock, but that’s rare in the AR world, and costs a LOT of money in the SCAR world....assuming you want a .223/5.56 weapon.
My wife has an AR Carbine, and she doesn’t find it hard to shoot from the bench, but she does find it tiring to tote around. She’s beyond the 30th anniversary of her 30th birthday now, so she’s not going to go out and get all ripped at a CrossFit gym. A gun that doesn’t weigh much more than her AR, but that keeps its weight closer in to the body might be a way to at least partially solve some problems for her. Given that VERY few civilians are going to be involved in an exchange of fire beyond 100 yards, whether or not a TVOR or BDR is good for much better than 2-3 MOA is pretty much a non factor.
I guess my point is that, while I don’t think bullpups are absolutely necessary, I do think that they are justifiable if someone wants to lay down the price for one. In other words, it’s not an unreasonable purchase.