The only thing I say is that (as a drummer) when there's no bassist playing, I ALWAYS feel just "off". I dunno, it's like having a bass sound gives my sound more "oomf" if that makes any sense.
Bass players help give drummers a "roof" of sound to hide under and drummers give bassists a "floor" to stand on. That's the best way I can describe it.
I like that description. Not perfect, but helps describe the relationship. Thanks!