Ultimate Team Playbooks

So I completed all the offense and defense styles on Ultimate Team and received the generic playbooks for each scheme and also was able to pick a team for each scheme. I noticed playbooks are allowed to be traded in for 1000 points/coins. My question is if I sell the generic playbooks but keep the team specific ones is that good? What I am really asking is why would I need two 4-3 Defense playbooks for example. I could use the coin.