As always it really depends on the situation... if you're ducking the bass with the kick, the EQ becomes a little less important since there is only a kick playing on the beats. There's times though when you may from a creative standpoint want a bass note on the kick though... take a listen to Queen's 'Another one bites the dust'. The bass on the kick is central to the whole groove, and in this case you want to make sure they sit cohesively together in the mix through something like EQ as I mentioned. Obviously side chaining wouldn't work here as you'd loose the bass note.
