It's actually good design at this point too, because it lets WOTC build out defined combo/synergy packages for decks to run without making them too wide open for potential abuse in the future, which could be a useful tool in the future if they want to add new archetypes to eternal formats without interacting with a lot of the old card pool. If they made a strong enough locked down strategy that didn't need/want most of the power cards or duals it could even open up the format much how dredge did before bazaar price hiked to the point it was no longer a budget deck.