> explains that leaving out overloading is "simpler", meaning _simpler for them_.

This also means your program code is simpler, and therefore, faster.

Function overloading usually means virtual method tables, and therefore indirect method calls. Depending on how deep your inheritance / overloading structure is, these vtables can get really messy.

(I had a class in university where we were given a C++ UML class diagram, and told to draw the vtables that resulted when one instance of a subclass was instantiated.)