There's not sorry. That four second is pretty nice (which is great for the modern american attention span) but there's not more action. You've been led to believe wrong.
Those 22 guys have full contact sure, doesn't mean there are more action.
And of those 22 not all 22 are making a tackle. Some are just eating space, some run out routes just to take defenders away.
Just like in baseball where a pitcher might throw the ball, a batter might swing and hit it, short stop grabs it and throws it to first, but the catcher is running down the field third baseman moving to his left and outfielders backing it up.
But, nope so many have bought into this idea that violence is action. It's not. Otherwise you would consider hockey and basketball pretty boring too.