The web is totally broken. It's not symmetric.Easy to read stuff, very difficult to write stuff. We ave a community of users who engage passively by … - Joe Armstrong

deployment is a problem because even if somebody made an open source privacy application, it needs 50 million users to take off. Apple and Google and everybody have dominated this way of deploying something to hundreds of millions of people [...] the first one to get a hundred million users wins basically.

You have to analyze the consequences of a failure and that to the specification.

If you do something and it fails you can do it again, it will work the second time. That's because quite often you are using something underneath where you've missed a message or messages are coming in wrong order.