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> There are people who need to operate linux servers without great familiarity with any of them

If that isn't a red flag to you, it should be.

what part of the tech world do you live in where it's not the case that almost everyone's not a Linux ace?

It's like that in aerospace.

Which part of the tech world do you live in where there is no concept of specialisation?

Do you expect graphic designers also write SQL Stored Procedures, or DBA's to crank out PSD's?

Does your business/product manager moonlight as the head of security?