Yet is there any actual underworld that doors represent, or just a myth their culture asses on from generation to generation?
That is irrelevant to the point I was making. Their understanding of reality is based upon their collective views of what reality is, tied to their language, and their entire frameworks with which they translate their experience of the world through. That is reality to them. It is irrelevant whether you think it is real in the way they do or not.
We are talking about how people understand what is real, because it is part of a collective imagination of what that reality is; be that a mythic reality, or a scientific reality. And here's the funny thing, no one recognizes that their own collective imagination or framework or lens through which they see and understand what is real, is conditioned. They just all assume everyone's but their own is false, like what you are doing here.
What is to be said of some of the new generation open minded to what doors actually do, and they do not really revresent an underworld that no one can define or confirm exists outside of traditional lore?
Generally the new generation just carries on the language and ways of thinking about reality to the next one. That's called tradition. When they begins to shift, is when environmental pressures, such as social or cultural shifts begin to occur, such as an Empire bringing disparate cultures together in a cosmopolitan setting. That's when the older traditional ways of thinking about things, begin to fail to properly translate anymore.
That's when you have the casting off the old ways in favor of new more able ways to translate the world. This is what brings about cultural evolution. This is what brings about shifts into new common collective imaginations about the truth of reality, such as the one you you have currently been assimilated into, unaware that it too is a system of symbols and signs as much as any system before it has been.
Try telling that to astronauts who are trusting your hard physics as they go into space. Or in surgery where focus and precision matters. Or engineers who designed the plane you are on.
Again, you miss the point. Reality is more than rocks. It is also the experience of the ineffable. It is also the experience of love and connection with life and others. These are much less simple than mere physics. If physics and math was all there was to human reality, we'd be nothing but organic calculators or computers blindly running programs with no real subjective reality. This is in fact what the whole myth of Mr. Spock was written to capture. Being human is more than just being logical.
But since you mention astronauts, you do realize that while they were trusting in hard physics, which is praiseworthy, they also have a common experience of what is called the Overview Effect as a result of what physics as a tool was able to give them access to on the back of a rocket. Many have deeply spiritual, transcendent experiences that changed their lives. This is more common than not. So, you have more than just physics to the human experience. Ask an astronaut, since you brought them up.
What does an unanswerable question like "why do we exist" have any relevancy to living?
Why are you a Buddhist if you think there is no relevance to human living in understanding the nature of our existence and being? Why not just work, eat, sleep, make babies, get old and die? Why seek Buddha Mind? How is that relevant to living, if it's all just physics anyway?
Does coming up with an imaginitive answer offer a human an advantage over those who acknowledge there is no knowable answer, and spends no time pondering it?
I would say there is an advantage to seeking something, rather than just kicking back and not doing anything at all to further understanding, even if the answer is in fact beyond comprehension. This is like asking, why does a plant reach for the sun, if it knows it will never reach it anyway.
At best it is an exercise of imagination.
And it is human imagination that is responsible for every single progress we have made since crawling out of caves millions of years ago. You don't understand this?
I suggest some of this compexity is how people can adopt illusions and fantasies and not understand they are illusions.
Exactly. Like having highly sophisticated scientific models of the universe and assume this is reality.
Maya.
They believe the illusions are profound and offer them some advantage.
Exactly my point I've been making. But do you not see that that is what you yourself do too?
I don't see any advantage clarified. It can even be a disadvantage, as we see in this who are creationists, or have some level of contempt for what science has discovered and explained of how things are.
I see a great deal of similarity between creationists and materialists. It's both a type of myopic perception that sees only it's perception of reality as valid, and the rest as just "imagination", not knowing that even that is imagination itself.