And if I ever needed to know for some reason, if it could ever in anyone's life possibly matter in the slightest whether this clump was called Cassiopeia by a bunch of people a thousand years ago, I'm about 10 seconds away from downloading an app that will superimpose constellations on my current sky. I can spend an hour reading about constellations and know more about them and their travels than many ancient astronomers could have observed in their lifetimes. And it doesn't mean a thing to me, because we know more about the universe than a handful of clumps that are occasionally visible to the naked eye.
I can appreciate the spectacle of a constellation, but everything about them that could possibly matter to my daily experience has been documented and indexed to the point that I never need to know it. I'm not trying to sail back to Ithaca. It has nothing really to do with urbanization and light pollution. Maybe I have fewer opportunities to see them, but if they blazed overhead every night, I probably wouldn't care one lick more about them.
One of the weirdest things I found while doing Astrophysics research is that people still use constellation names for most references. There are more thorough catalogue references to stars, but most papers reference "π Sco" (where Sco is short for Scorpius). It was quite bizarre, but it makes sense for a field that is that old. On the downside it meant that whenever a supervisor used relational terms to a constellation I would have to look at a star map (since I have no idea about constellations either).
Anyway my (currently) fiance used to use them as a pickup line(not on me though). She said it was pretty effective so there's that.
Why are constellations not something you'd normally know nowadays? Because most people don't get to see them due to increasing light pollution and urbanization.
I for one had a proper look at the Milky Way for the first time when I was ten years old.
There's simply currently less nature to behold in peoples' lives.