Not being able to receive messages except on one device isn't a minor inconvenience.
To fix this, you either need to authorize each device (and web browser) from another device that's logged in, or the central authority holds your keys.
I run WhatsApp concurrently on two phones and receive all messages on both devices. But generally speaking this is where we disagree - requiring all devices to be authorised by me is feature not a bug as far as I'm concerned.
