The section about waterfall being the only SDLC is interesting because it touches on the economics of shipping and software engineering practices: Continuous d

The section about waterfall being the only SDLC is interesting because it touches on the economics of shipping and software engineering practices: Continuous delivery only makes sense if the value of new feedback and delivered software is higher than the total cost of delivery. If you have to mail a floppy disk to each customer, that's a lot more expensive than just updating your production servers.