When to use a schematic VS a block diagram VS a Fritzing

[6v6gt]

This topic comes up from time to time, so I previously collected a few examples:

Fritzing Diagram - Rogues Gallery

A Fritzing diagram certainly has some uses, for example showing an absolute beginner how to use a breadboard to prototype a circuit consisting of a led and series resistor (assuming some unambiguous way is found of representing the led polarity, that is). However, for other purposes there are usually much better alternatives, even schematics drawn by hand can be better. Anyway, we all know this and all have had to stare at horrible, blurred images where essential detail has been obscured say b…