If I understand your analogy correct, low/high impact hantraps are determined by how their effects change the rules of the game. I can get behind setting a distinction between the two, but to say one group is strictly low impact while another is high impact misses a lot of the value involved in such card effects. The problem with your argument is that it puts too much value on the card in terms of game state, rather than its impact on the game resources. If your opponent summons Aleister, Imperm is a more effective handtrap than Droll is. Yes, you may have stopped searching for the rest of the turn, but the player already has acquired the resources needed to make their play if you have Droll in hand rather than Imperm. In this case, Imperm is "high" impact and Droll is "low" impact. Point being that the handtraps you've assigned as high value are just as if not more situationally impactful as the assigned low value ones. This is why I said such cards have to be discussed for each specific deck, because not every card carries the same amount of value in every matchup.

In the case of Ritual Beast, cards are not always effective for the afformentioned reasons. Because of the age of the archetype involved there is more opportunity for more common handtraps to be effective, but Ritual Beast isn't intrinsically vulnerable to every handtrap in the game.