That password protected wallet file remains password protected, even if you import that into a new electrum wallet ?
No, the password you set up only encrypts the wallet locally, if you or an attacker imports this wallet with the seed phrase on a different device, you'll have access to spend the funds on the wallet and set up a different password for the wallet on that device.
That's interesting. So as we say that the password protected wallet is encrypted, it is encrypted only if it remains on that particular system. If someone copies that wallet file generated by the electrum and imports it into another computer, it will not remain encrypted???
You do not have to encrypt the seed phrase because you can simply create a BIP39 passphrase. In this case, the seed phrase itself is useless without the additional passphrase, which you can write down and store in a safe location separately from the seed phrase.
So we can write a seed phrase on a piece of paper and make such a passphrase that we never forget, and save that passphrase in our mind. So now if anyone gets our seed or if the seed is somehow get hacked through malware or something, the hacker won't be able to get access to our wallet.
However, if the hacker gets the whole wallet file (encrypted one), then he can import it into another computer and can access the wallet ?