If the bass can't be clearly heard in the mix, then often I can't even listen to a song at all. There are many examples of this, for example, with Metallica. Countless other examples could be given. I know I may miss out on listening to good music because of this, but that's just the way it is and I'm not going to change. Of course there are a few exceptions. In some rare cases the song may be so good it would be great even with the bass in a minor role. Or there may be other cases where the bassist isn't doing a very good job anyway, so you might not care whether you can hear him or not.