This will come down to "personal preference". In my case, I struggle with star cards (Mantle, etc) in EX or below condition. If one of my star cards is below EX, I might as well not have it. However, I do not look critically at "OC". I have generally accepted OC as part of the reality in vintage cards. Creases are not acceptable and corner wear is the main focus for me.

There is no wrong approach so long as you get the degree of satisfaction you are seeking.