There is a fundamental difference between a brainwallet and…
There is a fundamental difference between a brainwallet and an encrypted key. A brainwallet generates the keys deterministically from a password. If you brute force all password with length 8, you brute force ALL brainwallets with a password of length 8..
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... You can't attack a single brainwallet. You attack them all. Since security is an economic function, incentives for hackers are high and security is weak. You must expect a brainwallet being constantly attacked by sophisticated, well funded hackers
Now, an encrypted key derives the key from a password PLUS an ciphertext. An hacker can only attack ONE key at once. That's why it's much more secure to have an encrypted key in public than having a brainwallet...
... That's part of why the bsv chain allows to store your keys very securely and highly accessable onchain. It is always here...