Why can't ps4 play ps3 games?

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Tags

1. #playstation
2. #allows
3. #option
4. #games
5. #compatibility
6. #discs
7. #stream
8. #using
9. #another
10. #download
11. #available
12. #library
13. #internet
14. #while
15. #there
16. #backwards
17. #gamers