The main purpose of a 5-string (low B) is not the extra low notes on a bass guitar from B to D#/Eb. The main purpose is faculty -- to be able to play patterns and progressions laterally rather than longitudinally (across the fret board instead of up-and-down the fretboard), which is more efficient and precise.
So...if you play repertoire that has technical aspects that would do better in this fashion, then a 5-string is most helpful.
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