I've always felt that these were pointless weapons, a solution looking in vain for a purpose.
But hey, that's just me.
What’s pointless are the silly, misinformed laws that brought these pistols into existence.
A short barreled weapon with more velocity and energy than most common pistols makes a lot of sense for a home-defense platform.
The incredibly popular .300 Black Out performs exceedingly well in a short (6-10”) barrel, especially when heavy, sub-sonic bullets are fired through a silencer.
In most places, a loaded rifle can’t be carried in a car, but a pistol can. It just so happens that the shorter barrels (<16”) are more practical for vehicle carry than their rifle counterparts. A pistol carried as such in a car often meets the criteria to qualify on a concealed carry license.
Not to mention that, those of us who have taken the time and expense to register short-barred rifles in our name are required to file annual paperwork with the ATF for notification and approval to take our legally registered short barreled rifles to states other than the one in which we reside. So, even folks that have legal SBRs still have good reason to keep at least one AR pistol.
In sum, the silly laws on the books not only drove us to build AR-platform pistols, they’ve given us lot and lots of good reasons to keep them.