I think anything extra you can learn is an advantage. Even if you don’t learn it to an operation level but understand how FEM works, understanding mesh density vs number of nodes vs calculation time. Also physical testing vs FEM.

Knowledge is power, never stop learning.

Not only a FEM package but FEM as a whole. Now mechanical engineering is inseparably connected to FEM.

Dear Gokul, Hello, Nice and basic question, thanks. It seems to me not only mechanical engineers but also structural , civil, aerospace and aeronautics engineers, and in general all who work with structural systems and need to be aware of the structural behavior (and even more, all who are involved in analysis of Partial Differential Equations) should also know enough about the broadly accepted tool for analyzing the behavior of these systems. This tool is finite element analysis, and for implementation of finite elements in practice or academia being familiar with some related software and packages would be very helpful. In this regard, the amount of the essential knowledge seems depending on the area and depth of your study or work. OK, have a nice Sunday and nicer future.