I think perhaps your expectations of Fritzing are too high :-). It only produces the schematic and pcb, it doesn’t do simulation so it doesn’t need (unless you want it for the schematic) the internals of the part. It doesn’t care what the part does, only what connections it has to other parts. So as long as you have the pin names on the box you can connect power supplies, resistors and switches to the pins to make your circuit. The idea is that you then build it physically on a real breadboard and do the testing there.
Peter