Graboids are individuals with different preferences. Some are picky eaters. Some wolf their meals. Also, if a person’s arm happens to come off while being swallowed, the Graboid might necessarily know it, and would have a hard time finding it after the fact (as it will be making no noise).
The other answer is that in T2 and T3 we had better Graboid moving special effects rigs that could raise them up and down much faster, so it was exciting to for us to get to lift one up with a whole person actually riding with it.
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