Important yes but BIND can also afford having crashed nodes without the internet coming down to its knees. I'd be surprised if such a node came down and caused

Important yes but BIND can also afford having crashed nodes without the internet coming down to its knees. I'd be surprised if such a node came down and caused damages in the hundred of millions of dollars in the process. This is the distinction I wanted to make. I can't remember the last time my DNS didn't work. The internet can afford to be 'good enough', life critical software can't.