There is a vast difference between the practicality and useability of a Draco with a "brace" and one without. The brace transforms the clunky unwieldy "pistol" essentially into an SBR, the Draco becomes a semi Krinkov. SBR's are useful compact powerful weapons that exceed the capabilities of typical handguns both in range and power.
The AR, with its buffer tube, is the same story. The weapon can be shouldered and fired accurately to distances well beyond what can be done with a handgun BECAUSE it can be shouldered. And I have little doubt that with an optic and some practice, the Draco/AR pistol can be fired unsupported surprisingly well at pistol distances. But adding an optic only makes the beast more SBR/carbine like and less pistol.
While their are indeed "pocket pistols" that do not necessarily need a holster (though I think some type of pocket sheath is a good idea), you are not going to pocket your AR/Draco pistol. And while you can conceal a great deal under a coat or in a pack, the practicality of such a practice is suspect. If everybody in the locale is wearing shorts and shirtsleeves, you're going to stand out like a sore thumb in a jacket, and be pretty miserable in the process. The same can be said of a pack or gym bag. While the commuter/student backpack has grown in use, it is still not a common item across much of the country . Walk into the diner or pharmacy in our little town with a backpack, or a jacket in July, or a sport coat for that matter, and you will be noticed. A fanny pack/gym bag/backpack on an individual that is clearly not a student, or possesses same in an area where such is not a commonly seen item, tends to stand out as well. Additionally, any type of off body carry has certain disadvantages.
Nobody in their right mind will opt that a Draco/AR is as concealable as a G17. While not technically sound, I'd offer that if you cannot fit your "pistol" into a holster, wear it all day and not be terribly uncomfortable, and have a reasonable degree of concealment if that is a concern as well, you do not have a good defensive pistol and concealment arrangement.
I never saw the specialty hunting pistols like the TC Contender or the XP-100 in the same light as other handguns. Most were best carried on a sling about the neck. Essentially, they were carbines sans buttstock. I tend to view the AR pistol /Draco family the same way.
OK, rant over. I have used an old Elmer Keith quote several times on these forums before, and now seems a good time to use it again. "I'm for anything that burns powder". If you are a fan of the Draco/AR pistol, good on you. You can put it in the safe with your Judge and Mares Leg.
Shoot the snot out of it, tote it about all you want.
Somebody asks me what I think about the breed, I'll offer my comments. Doesn't mean I have to be a fan too.