In the past i had proposed this simple rulle:
1 card per ARTWORK, meaning you can still use mutliple cards with different artworks. In that way:
1. Decks like BEWD can use 3 copies and have access to their fusions
2. Konami can improve their sales since everyone will search for rarer alternative artowork cards.
Ofc, as long as Konami doesn't decide to release dif artworks for every single card.