When they play together, there are two basic and simple techniques;
1. Ducking, using a compressor on the bass that is triggered by the kick. so durring a short durration, "the attack" of the kick, the bass is ducked for a bit. To allow the kick to "punch in" because they are both typically down the pipe/middle.
2. EQ, you find where your kick EQ sounds good, or you like it, and see if you can cut a notch in the bass right at there? Or somewhere in a range that includes that freq.
Other than that, you can look for freqs in the bass or kick that compement? And boost harmonics? With tight Q's. Fortunately, my music doesn't really require this kind of precision? I think these techs are more important for modern hip-hop styles of music which are "dominated" by the bass and kick.
"It's fine for a musician or bassist to play whatever he wants. I'm just saying, when they go up high, the bottom drops out and it does. Whether it bothers you or anyone else like it does me isn't the point. The point is it DOES drop out and it presents quite a difference in my opinion. "
And let's face it? WE ALL LIKE A NICE BOTTOM!