The guy in the vid mentions "tube jam". What he's talking about is a double-feed from the magazine. The magazine tube has a small pawl that releases one cartridge into the lower receiver which is then lifted up into the action and fed into the chamber. It pops back and prevents the next shell from following it in. If you put an extended magazine tube on a shotgun it makes this problem more prevalent. 7 shells compress the follower spring more than 5 and that increases the tension on those first two cartridges. If you really think you'll need more than 5, you probabaly need more guns- or a better neighborhood. Or a different line of work

More isn't always better. Fancy isn't always better. More arguments have been ended with the old, now-useless .38 Special round fired from an old-fashioned Smith revolver than all other calibers combined.