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Well, all the promoters promote these because most of them don’t understand it or has money incentives. These models consume HUGE energy to run and a lot of knowledge to coerce an useful result. You as a developer has the knowledge to ask these questions, but if you look at the people who are looking to cut costs(management), most of these people are not adequately knowledgeable at all. Look at any decent sized corp or even startups, most management have difficulty correctly fleshing out a proper and clear requirement. A product that is successful is like a garden, it needs tending and I don’t see these manager types having the knowledge to tend, else we would be all out of work several decades back. The thing is, everyone can use a hammer, but only the experienced ones can produce a crafted creative good. Everyone can probably pain a banana but only the real artists well practiced can produce an aesthetic portrait of a banana.