Why are headings still magnetic?

Mxsmanic wrote:
Like AM radio, magnetic headings are still with us, even though
navigation in general has advanced by leaps and bounds. When will
true headings be used? The magnetic poles are in continuous motion;
the rotational poles are stable.

Eventually, the magnetic poles will move so far that every station and
aircraft everywhere will have to be recalibrated to account for it,
and all charts will have to be changed. And the poles occasionally
reverse, which would also be somewhat of a disaster for
magnetically-based aviation.

Any Earth-based coordinate system is bound to be out of date soon.
We'll be navigating to the moon and other planets and the concept of
"North" won't be relevant. So, we need to figure how navigation will
work in the Solar system and embed Earth navigation in that system. My
guess is that a system similar to GPS but with stations on the other
planets will work until we venture out of our Solar system.