> claim that you never incorporate feedback I'd say this is the case more often than not. In order to advocate for Waterfall instead of any Agile methodology

> claim that you never incorporate feedback I'd say this is the case more often than not. In order to advocate for Waterfall instead of any Agile methodology during the last decade or so one has to be overwhelmingly blindfolded by the religion. And these kind of folk tend to be quite strict in their faith. As in: "we had enough time to discuss things and think it through and now it's time to stick to the decisions we made". And yes, I have witnesses just that quite a few times. I know a software company that strictly uses classic Waterfall even to this day. A minor feature that should typically iterate in production for like 3 or 4 times and be done takes them about a year to implement and still never deliver what the customer wanted. And I'm not exaggerating. (The company prints free money from another line of business).