In madden 15 you could use the non team books in cfm and assign them. That game had the classic coaches books like Madden, Lombardi, Bill Walsh. I just popped this game in a few weeks ago before 21 came out.
You could also use the plays from those books in custom books. I think this was the last time you could do this. I don’t really remember madden 16. May’ve been on that one. But i believe 16 is when they took out the Legendary Coach’s playbooks.
Losing those books was a huge hit for classic roster makers. Those Legend’s books had the old school pro set and far/near formations.