Why the new packs contain cards that I already got 4 copies of

I agree with you that the randomness makes the game life like, you have cards and heroes that I don't have and vice versa but after playing the game for quite some time you get a lot of cards that you already got 

I also agree also that buying cards from the store, the packs doesn't care about what I have, sure it's true but this is an electronic game there is no physical cards hence the name Electronic Arts 

I think the best way to every one get satisfied is to add a section in the packs icon that section contains only card that you don't have and you know for sure what you will have not (The packs may contain)  and of course this packs should be much more expensive than the ordinary packs.

Or every thing stays as is but when I have let's say any extra card -a fifth copy-  that fifth copy should be replaced with another card with the same ranking rare, super rare, legendary 

like if have a fifth octo zombie , it's now extra legendary to me, what i'm suggesting is to be able to replace with another legendary not to recycle it the the quarter of it's value

Thanks