Some of us write software for embedded devices where a mistake in programning means a critical machine in a remote area needs someone to physically go there and thus spend months in test before we dare deploy. Some of us care about quality and won't allow a customer to see bugs thus even though we can deploy in seconds our reputation won't allow it. There is also software that bugs can kill people so again we won't deploy without evtensive testing - much of this is regulated and we would go to prison for deploying at will even if it works.

those who work in any of the above react in horror to stories of how the web deploys to production so fast. we know we are not perfect and don't understand how you would risk it.