Final answer:
Pin insertion tools with burrs or sharp edges can damage components, create poor connections, or cause shorts, which is why they should not be used.
Step-by-step explanation:
You must never use pin insertion tools with burrs or sharp edges because they can cause damage to the components or the board you are working on.
The use of such tools can lead to poor electrical connections or even shorts.
Pin insertion tools are designed to be smooth and free of any imperfections to maintain the integrity of the pins and the areas they are being inserted into.
A tool with a burr or sharp edge can scratch or deform the pin, which can compromise the connection, or in worst cases, snap the pin.