I understand that the 25th word is to protect your assets when your 24 seed phrases are compromised. But I have some questions:
If I use a simple word as the 25th word, it will be easily brute force attacked. So is it useless unless I set the 25th word very long (20+ chars) and memorize it using my brain?
Or the situation is like this. The address with only 24 words has a small amount of crypto that you can lose. When someone gets your seed phrases, they think those are all your assets and did not realize you hide most of your crypto in the address protected by your passphrase. In this case, does it mean that I should not let anyone know I have a hidden wallet with 24+1 words?