I do gigs with and without pedals. I don't rely on them, I use them.
None of them are necessary but all of them are fun, it just depends on what music I'm going to be playing and my mood. So it could be just my bass, cable and amp or I could choose to have a drive, filter, pitchshifter, vocoder, volume, Synth or modulation pedal. If it's a jazz gig I might use none, if it's funky I might use all. Bass guitar is a modern instrument, with a vast textural and dynamic range, effects can be used to enhance it.