Like everything it depends on the music you play. I play Gospel and and contemporary jazz and I'm using my B string regularly so a 4 would not work "for me". If the songs you play don't need a B string then "you" don't need a B string.
Yeah. I have a 5 and I need/use it regularly for church and contemporary jazz.
Last night I had a rehearsal with my R&B/Soul/Funk horn band for NYE and I didn't touch my B string. I suppose I could have a different bass for that band, but we don't gig very regularly so it isn't worth it. If we played once or twice a month I might go and get a Squier Jaguar or something like that, but until then, I'll just use my B string for a thumb rest and favor the neck pickup just a bit.
