How else would you score? In practice you don't kick the ball at players in football (soccer) or kick/throw it at them in rugby because you might give away possession; but it's a tactic in hardball games like baseball and cricket AIUI.
I've only trained as a referee in one sport and it had a "be a sportsman" element to the rules giving the ref leeway to determine that play is unbecoming of the sport and so give away a foul. But in that sport smashing the ball _at_ players is normal.
Sure, if you're playing with pals, or for a promotional video then you're going to be less combatative.
FWIW the rules don't say you can't knee, pull, or poke (eg in the eye!).
Also, the penalty rule sounds impossible - you have to score "from the centre gate", but being in the centre gate is a foul and gives possession to the opposing team ... ah, no, wait: "Moving through the center gate will result in a foul." ... so it's fine, you just aren't allowed to leave the centre gate [does the foul activate from the time of entry or the time of exit?].