You don't need the password if you will import the private key but you will need it in case you loss your key and you save the json file since json files need the password so that you can access. Just save the password together with the json file just to make sure you have a backup key in case shit happened to your keys.

I experience this already when my laptop got corrupted which contains my priv key. LucI save my json file on my google drive which I use to recover my ETH wallet.