Probably this has already been discussed; most new users would be annoyed to find out they have no access to their accounts from other devices, or perhaps even with no way to get back if the cache from the browser they used to create an account has been cleared, for instance.
I'd suggest changing the BACKUP BRAINKEY RECOMMENDED for something like BACKUP BRAINKEY ^^^NEEDED^^^. or better making it a mandatory step.
Brainkey generation (or Wallet Management) page should then explain that for security reasons, for users not having to trust on a third party, all they're account keys are managed, encrypted and stored locally in they're browsers. That locking they're accounts is the way to prevent other users on that device to access that account, and specially that creating a backup, Brainkey being the most practical, is the only way to hold possession of that account and to be able to access back from any other device they want. Otherwise, once the browser cache is cleared, recovering access to they're accounts might not be possible.
Something like that but in English
what do you think?
Edit: forgot to say it's looking great