There are different kinds of skills. Postgres vs spark is one kind. C++ vs python is another. Statistics vs networking is a third. The top of the skill pyramid

There are different kinds of skills. Postgres vs spark is one kind. C++ vs python is another. Statistics vs networking is a third. The top of the skill pyramid changes quickly, but the fundamentals change slowly. A tool might be outdated while the solution it implements is not. (But “ooh shiny new thing!” can still be a problem)