It's not even that. In general, Konami believes that hand destruction is a bad thing. All the staple cards that discard from the hand, e.g. Delinquent Duo, Confiscation, Trap Dustshoot, are banned. Royal Tribute, Wind-Up Hunter, and Evigishki Gustkraken had effects that make your opponent discard from their hand, and either they or their engine got limited. All the cards that can potentially discard from your opponent's hand either have great drawbacks, like Aoi or Mind Crush, or require specific situations to pull off, like attacking directly with Spirit Reaper or X-Saber Airbellum. So that's why cards that can discard cards from the opponent's hand, especially ones that discard multiple cards, are not very realistic card ideas.