My spirit left my body when I read DevOps (or, how I'd like to call it: DevOoops) for aviation. That's mighty tarded. My software has bugs, hell, I even know some paths that throw unhandled errors. The worst thing that will happen is a notification for an user and me being pestered by an e-mail with a stack. It's my fault, I'm just too lazy sometimes. It happens.
But you do not write specialized, limited in scope, life ending if you get it wrong, software like that.
DevOps vs. Waterfall is like comparing hammers to blueprints. It make only make sense in a tech-speak spawning Wu's brain. It's like confusing "what I do" with "how I do it?".
For those not in the know, DevOps is a marketing terms for what most of system administrators used to do, but packaged in a shining bag (with, I admit, some great tools like Ansible) — an automatic way of dealing with infrastructure and application deployment. It's your hammer for hammering your servers to act how you like with little overhead.
Waterfall is an once dominating methodology of software development. You collect requirement, you build off them. The trick is in the details, first phase is never accurate enough, and the second phase never satisfy the first phase. But it's often the only way to bring software that's tangled in red tape.
For this shit to work you need engaged people, project managers who can negotiate and bosses who are not afraid to push someone's shit back right into their assholes. So it can work, but it often does not.
The old school software practices, while cumbersome and not glamorous, produce decent results. This is the closest software gets to engineering. You can get an run of a mill engineer to build you a bridge that won't collapse, but you need luck to have software project working because we deal with garbage in/garbage out, not physics.
Wu just heap fresh shit on the mountain of bullshit. Her "solutions" are stupid and anyone who had to deliver running software can spot it in an instant. Software development is an art, but it's mostly "Picasso drawing you an portrait". You're lucky if your nose is near your face.
(I freely admit I'm drunk on whisky, I just got a bit a-loggy)