I would argue it was never in style. One of the first uses of the phrase "waterfall" was by Royce in 1970, when he held is up as a strawman of the obvious-but-wrong solution.
It keeps showing up for two reasons:
it maps easily to the methods that people use to produce physical goods
it maps easily to software-produced-under-contract
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I would argue it was never in style. One of the first uses of the phrase "waterfall" was by Royce in 1970, when he held is up as a strawman of the obvious-but-wrong solution.
It keeps showing up for two reasons: