What is a disadvantage of decreasing the number of wire segments in an antenna model below 10 segments per half-wavelength?

In antenna modeling software utilizing the Method of Moments, simulation accuracy depends heavily on how finely the antenna wires are divided into segments. A widely accepted rule of thumb is to use a minimum of 10 to 20 segments per half-wavelength. If you decrease the number of segments below 10 per half-wavelength, the mathematical model becomes too coarse to accurately capture the rapidly changing current distribution along the wire. The most immediate and noticeable error resulting from this low resolution is an incorrectly computed feed point impedance. Distractors involving mechanical stability are incorrect because segmenting is a purely mathematical software construct, not a physical building technique.