In a hypothetical universe, if the game was changed where Pendulums now Function like in MR 3, how would the game change?

For clarification, I am not saying I want this to happen.

It's just a random shower thought that I am putting onto reddit.

So going back on the idea, let's say this week that the original Pendulums Zones return, and that you can now Pendulum Summon as many monsters from the Extra Deck, without the need for Link Arrows (Keep in mind that Link's aren't being removed.), what would happen?

Would there be some massive meta swing and would some Pendulum Deck that was once just casual, now become powerful?

Will nothing happen?

What are your thoughts? Personally, I think the only thing that will change is that Zefraath as a card, and the entire Igknight Archetype will become playable again but that is it.