Full auto fire isn't precision fire - you aim to put out a "cone" of fire which amounts to the MOA dispersion plus the gun rattling off the bi- or tripod. It does spray bullets - and exactly what the intent is, to provide coverage of an area to some degree.
You don't want to be that guy popping up from behind cover because dodge left or right the cone of impact can be large enough to still hit you. It is NOT precise at all.
Now ask yourself exactly how the average shooter gets much out of it in this day and age of firearms use. Is the Bumpfire stock a common option on many AR's sold right now? No, it's still a niche product for a small number of shooters. Have we seen Bumpfire stocks being used in 3 Gun or other competition shoots? No, there is no advantage - we don't set up the scoring to prefer more rounds being shot less accurately for the win.
So, who's going to bother getting a trigger on the AR which fires on pull, then fires on release? As said, some trap shooters do, is that trigger a major selling option for duck and goose guns? No.
All it does is simulate full auto in a legal manner, and it won't get you more accurate shooting or garner any points for getting more hits. Except in some people's minds, as a self defense weapon.
If you were confronted by someone shooting at you with this trigger, would it actually unload the weapon more accurately and faster, making it more lethal? Not so much - it can run away, causing jams, and after the first three or four shots if you couldn't make it to cover, why would it be any worse than a semi auto shooter just pulling the trigger as fast as they could?
In short, it really doesn't do to much extra, if anything, and certainly not better. Again - the trigger has been on the market for shotguns and isn't that good an idea, most shotguns still don't bother with it. AR's? Same, and option on one makers and nobody is rushing to have them in most of the product line. For most shooters it doesn't make them more accurate, and certainly does empty their pocket book by consuming ammo much faster than before. We already have an issue with that shooting 5.56 because it recoils less and lets us shoot more, but there is a threshold where enough is enough. We shoot 5.56 - or 7.62x39 - because it's cheap. The alternate cartridge shooters paying $1 around aren't popping that many rounds unless they reload or can get real bargains.
I don't see this as some crazy ticket to a ban - anybody can abuse any firearm as it is, in fact, many of them used in "mass" shootings are completely legal "lo cap" magazine weapons nobody tries to specifically outlaw. If anything that is the point with the antigunners - somebody uses a normal gun but they put out reams of releases about the evil black AR15's we need to outlaw. They use anything they want to push their agenda even if there is no direct relationship whatsoever.
If you don't like the concept it would be better to explain in some detail why - because waving the "ban" flag isn't the valid reason and doesn't fly.