The world of IT is ever changing. Back when I started writing about computers in 1984, smart IT folks were leaving jobs managing mainframes and learning about microcomputers and early local area networks (LAN). That turned out to be a career blessing.
These days a transformation of the same magnitude is occurring in the form of the move from on-premises to cloud computing.
In the mainframe days, MIS Directors often were responsible for bringing in LANs, micro-based servers and PCs, and hired staff to manage all this. Mainframe operators, in the meantime, became LAN and application managers and PC technicians.