There's rarely any useful signal that low for instruments other than kick and bass anyway, so stripping those rumbles and thumps out just keeps the waveform more centered overall. That lets you increase the overall loudness without clipping.
For me, things get muddy when I have too much going on around, I don't know, 100-300 Hz. I high pass tracks to clean up the mud there. Below that, the high passing is mostly for dynamic range and loudness.
Often you have to make sure that there is not multiple things going on down there, so you high pass a lot of the elements in a track. Then the sub of a Kick can’t be out of phase with a sub bass. You can duck one of them so they dont occur at the same time (probably still the way a lot of people do it), or you automate a high pass eq in relation to the other sound which can cause other phase issue but tends to work really well and is easy. Or you align the waveforms of the kick and the bass to match in phase and control the ducking more manually.
It also depends on the playback medium to some extent - vinyl has a slightly different set of challenges to digital.
Check this out for reference: https://youtu.be/K-eneMG_DVE