A brain wallet isn't where you store your life savings, it isn't what you want to pass on for the next generation.
A brain wallet is a last resort, national disaster and couldn't get all the cash from under the mattress?
You need to leave your home asap and flee an oncoming calamity? Stuck in an airport somewhere and the card declines? Political tension? It got you.
I know people who had to flee their homes in an incredibly short period of time to stay alive. Those living in 1st world highly developed nations will mock this, but they'll never know when they might need it; if not at home, then maybe elsewhere.
Unlike hardware, only you can giveup your keys.
Unlike hardware, it can't get lost.
It is protected by human will alone.
They want to take away your btc?
Come and take it.
You should also practice other good practices as well familiar to this community.
This post was probably less well written as I find this topic to be somewhat emotional. Nevertheless, tell me what you think.