Finite element is not a skill, but a mathematical method. With the ready-made finite element software, it can be used directly, regardless of the mathematical methods inside. It's like a math calculator. You don't have to care about the mathematical theory inside, so you can use it. From this perspective, the landlord does not need to make up math.

On the other hand, finite element is just a calculation tool, and its object is generally mechanics. A good finite element user must have a deep understanding of the mechanical mechanism of the mechanical object to be analyzed in order to establish a correct finite element model and get reasonable finite element results. From this perspective, the landlord's tutorial mechanics seems to be more important than mathematics.