The basic tenet of logic is that the structure of an argument can be analyzed without bothering to consider the content of that argument. This is generally faster than trying to verify the premises contained in these arguments. Not only does this save you the time that you would otherwise invest in refuting bad arguments, it also provides a useful fitness function for improving your own arguments.
One useful aspect of knowing the fallacies is that you can quite easily construct a counterexample. It’s not rhetorically effective to mumble something in latin (ad hominem, tu quoque) without further explanation.
