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- why to use more mesh elements in finite element method?

the simple rectangular isoparametric element (curved edges element) can be used to generate many complex shapes like..

square to circle

square to triangle

two square elements to annular.

and the results i calculated in python code (2D case) are very accurate, then i confused why to use complex mesh generator software etc.

for example, i calculated electric field distribution complex shape waveguide using single rectangular Lagrange element of order 4 ( it has 25 interior points). here i didn't used any mesh generator software

square to circle

square to triangle

two square elements to annular.

and the results i calculated in python code (2D case) are very accurate, then i confused why to use complex mesh generator software etc.

for example, i calculated electric field distribution complex shape waveguide using single rectangular Lagrange element of order 4 ( it has 25 interior points). here i didn't used any mesh generator software