You’ve implied that it could be implemented in Casual, but haven’t gone so far as to separate Casual and Ranked. Similarly, a lot of people have been talking about the topic of implementing this on Ranked as per OP and assumed (based on your posts defending the topic) that you were also defending the implementation of this on ladder. There’s just been a miscommunication between players here. I think, strangely, most of us are can agree on the subject outside of the OP.
Kitchen-table paper CCGs are a pretty good example that reflects reality, at least to a degree that justifies using a Class/deck/card ban system in Casual.