Purely my anecdotal experience: Everything tends to waterfall because the natural human "thing" is to create a process which can be repeated to ensure success

Purely my anecdotal experience: Everything tends to waterfall because the natural human "thing" is to create a process which can be repeated to ensure success / quality / <thing deemed good>. If Agile thing worked, let's package it up into something repeatable and follow that to the letter... Oh, waterfall. Agile requires constantly working against that, which is hard, because Managers want and love safe and predictable and measurable against something concrete. Make a framework rather than a process, but that's a fine line. Agile ultimately needs trust in the team to be able to think on their feet for every scenario coming into their board. I'm my experience this trust either didn't exist, or is treated as a second class citizen to said safe, predicable, measurable, repeatable process. And I don't believe necessarily that Agile is the be all and end all.