Punching a paper target on a static range, with all the time in the world to set up your aim, no drenaline pumping through your system, is cute and all but you are only trying to convince yourself if you think that having a stock doesn't make you significantly more accurate, faster, proficient, allow you to reaload much faster and easier (shotguns are always empty), makes handling the shotgun MUCH easier and efficient and exponentially multiplies your survivability rate in the event that you have to use it. No stock means all the weight is in front of your shooting hand, no stock means you don't have any support points behind your shooting hand to efficiently manipulate your 100% imbalanced shotgun during use.
From any practical point of view, stockless shotguns make no sense whatsoever.
Deliberately running a stockless shotgun is setting yourself for failure. Full stop.