After years working with many RF, Spice, and EM simulators, I don't understand why is still very complicated to add (in most of them) a single component to the library, or to draw a simple structure.
I am pretty sure the teams that developed programs like Keysight ADS, Cadence AWR MWO, Ansys Electronics HFSS, CST, Comsol, Sonnet, Altium Designer, etc., they have the knowledge and the ability how to simplify these inputs, but for unknown reasons they don't do it.
Maybe LTspice is the only program from this category, where you need less than a minute to add a new component to the library, and MWO has the simplest interface to draw a structure..