Sadly, as long as there are politicians that are neither hunters or shooters, stuff like this will continue to be a focus of the ammo and firearms manufacturers..
there are states that require straight-walled cartridges for deer hunting.. so manufacturers develop things that appeal to those markets...
ammo manufacturers want to sell as much ammo as possible.. so.. their marketing teams also do the best they can to sell their "new" products to other markets and create campaigns to compel buyers to buy..
the laws make no sense.. because the people drafting and passing the legislation have no clue about the very thing they are passing the law on...
a straight wall cartridge that flings a 200 gr projectile 2100 fps is no more or no less "dangerous", "deadly", or "effective" than a bottle necked cartridge that flings a 200gr projectile 2100 fps...
then consider the states that establish a minimum of 24 caliber to hunt deer.. but at the same time allow handgun hunting..
a .223 will generate roughly 1700 fp of energy... most handguns will generate about 400 fp.. a .44 mag only produces about 750 fp with a hot load..
but the state is perfectly ok with a guy taking a shot on a whitetail at 80 yards with a long barreled .357 mag? but that same guy is committing a crime if he takes an 80 yard shot with a 20" barreled 223 on the same deer?
as long as there are politicians, there will be truly stupid laws... and as long as there are stupid laws, there will be sensible people finding ways to "legally" meet the requirement to accomplish the intended mission..