Issues about FEA that sales departments may forget to mention.

Re-Entrant Corners

The focus on drawings can lead to rushing the drawings where the fillets are not drawn for every re-entrant corner. St. Venant's theorem indicates that these errors can be small if ther are no major load paths through that area. If the mesh is held at the drawing level, this can be a decision made for future designs where this assumption may not apply.

Yet re-entrant corners are still found in major magazines as a showcase for a "good" FE model. And the error can be infinite for even a modest re-entrant corner: Like in this collage of the following paper's results.