This is not even a computer level issue, it is a personal identity level issue. If someone were to DOX you, after you posted that you have "x" BTC then anyone would know that you have that level of BTC and would likely attempt to launch an attack to steal your coins, either by hacking or by breaking into your house to steal your computers (among other potential attacks).
Passwords are in my brain. Can't really hack that...yet.
Breaking into my house? Bring a pistol...because you're going to need it.
What if you are not home? This is when the vast majority of house robberies happen. There is no way to stop them if you aren't home. Once they have the file/wallet that is password protected they can simply use a brute force password cracker to attempt to unlock the wallet.