It’s only useless if you don’t know what perfect forward secrecy is and would rather complain than look it up. Yes, this feature is provided by Telegram and Signal (probably WhatsApp too). It makes it so someone who compromises your key can’t read all past messages. It’s pretty important. Future secrecy (key compromise doesn’t grant access to all future messages) is also important. Keybase only has forward secrecy for its exploding messages.
These are why I’d never use Keybase to chat even though it’s better than Signal from a usability perspective.
These are why I’d never use Keybase to chat even though it’s better than Signal from a usability perspective.