It looks really complicated and brain wallet isn't safe because there's a risk where your might suffer brain injury when you're accidentally crash during driving or getting older.
Actually. I think Brain Wallets are not safe because they are so much easier to crack. There was a time using Brain Wallets was a thing and some were able to crack thousands of used Wallets in days because people were using Wallets that were not strong enough. Our minds are not very good when it comes to creating random strings of characters. So we implicitly create not so strong passwords and Wallets for ourselves.
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Regards,
PrivacyG