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I was definitely talking about adoption ;-). See my comment https://news.ycombinator.com/item?id=13400707

I've had a similar thing recently. Somebody asked me about learning "old technologies", like Perl and CFEngine. Perl 5.x was published in 1991, four years after initial version, Python was published in the same year, and Ruby merely 4 years later. CFEngine 3.x, a complete rewrite that carries over very little and only very high level ideas from earlier versions, was released in 2008, three years after Puppet, and only one year before Chef.

Some people just lack the perspective.

bash is an extended clone of Bourne shell, though, and sh dates to 1977.