Will be shooting some tomorrow (it is Diwali in India), I am curious, why the reccomendation for shooting longer exposures?
Just depends on what one wants the image to look like. Long exposures tend to match what we see...persistance of vision and all that -- we tend to take in the launch, peak and decent of a firework as a whole, when in reality, the tail of the firework can already be disappearing as the firework peaks.
Also it is easier -- less worries about timing the shot.
At least with LF landscape, a bad day of photography can still be a good day of exercise.