Photographing fireworks on film surely does require more work than when shooting digital.
With pyrotechnics, the stars of the show are quite literally shooting stars (“stars” being the fireworks industry’s term for those bits of flying sparkly fire). As in any performance, stars need a stage, and in a photograph the stage is everything else in the frame: the dark sky, buildings, or monuments, even your fellow audience members watching the show.
Although shooting on film eliminates digital photography’s near immediate feedback loop, it has other advantages. If you use color transparency film, you give up dynamic range with film and the ability to easily manipulate color in exchange for sensationally saturated color against a very dark background. The challenge is to get the exposure right while shooting without resorting to post-shoot processing manipulations. On the other hand, ISO 100 to 400 color negative films have an inherently large highlight range and lower contrast which is great for recording the color and details of the bright but short-lived streaks.