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.
For online attack, remember that your seed phrase can be seen together with your passphraseon online wallets. The only wallet that I did jot see the passphrase is Bluewallet, and it is not supporting passphrase while generating a new wallet, you can only import a a seed phrase to input the passphrase. Yet, we have to be careful of online attacks.