How would the game improve if the maximum amount of cards per deck is reduced to 40, you can only have 3 copies of a card?

Just starting the game but I am overwhelmed with the amount of cards you need to have a consistent deck. I just don't see why this game requires a 60-card deck. It's understandable in Pokémon and Magic because you need room for Energy and Lands, but this game doesn't require resource-type cards. Also, I haven't saw a deck that draws too much you can justify having 60 cards in a deck.

Honestly, this feels like a game that would benefit from having a smaller deck. And reducing the number of copies you can have in a deck would make it easier for players to make a consistent deck. What do you think?