Well if you interpret it as "do completely different jobs of different teams" of course it doesn't work. It makes sense in single team context, say one person

Well if you interpret it as "do completely different jobs of different teams" of course it doesn't work. It makes sense in single team context, say one person being very good at SQL but rest of the team having some basics will mean most of the "simple" tasks related to can be done by anyone instead of shoving everything onto expert. Or say having just enough frontend skill that backend team can create their own internal admin panel for a service without involving frontend/UX in it and paying communication tax.