If you have a 5 string and you don't use the B string, you are not a 5 string player. By definition, one who plays a five string bass must use the B. If you have a 4 string bass and never use the G, you are only a three string player. In some metal bands I was in during my younger days, I was technically only a two string player. Hope this muddies the waters of bass philosophy a little.
)