Ok. So I am sitting here thinking about this statement. True. If you close a card it is still on your credit report for 10 years. Why would closing an account change anything.
But. What if you closed the account and got the creditor to remove all trace of the account from your CR? Maybe an account that is hurting your score can effect things if you removed the tradeline?
I don't know, just throwing this out. It can also backfire if the account was helping your score.