There is nothing wrong with playing marginal hands in deep stacked game although 10 4 is pushing it. There is a difference between playing these hand profitably and donking. For example you have 6 4 suited and are in the big blind. There is a 3x raise and one call and you 3 bet 2.5x. This is a strong play because the likely outcome is you will get at least one fold and your 6 4 suited has equity vs many hands that will call. There are many situations like these but there are a ton more where it is -ev to play these types of hands. In PO freerolls it is hard to ever justified playing these hand while maintaining +ev due to the aggressive players and the fast moving structure.