It is a good way to keep your coins protected if you plan to accumulate them and in case some "friend of the alien" visit your computer, make a copy of your wallet and break the password by attacking it by brute force. The disadvantage is that the more layers of security you add, the more work, and maybe for a few satoshis, you do not need that much.
If we have a small amount of bitcoin, we can put it in the wallet application, there is no problem with the exchange. In fact, this benefit is to facilitate the transfer of funds, the roll-out, but the disadvantage is actually not the highest level of security.