What is the practical significance of making a claim that rocks existed before there were humans to name them? The question is what we are doing when we name a rock, when we construct a theory about what a rock is. — Joshs
I would say that the practical significance in this is, that regardless of human consciousness and ability to philosophize, reality exists with or without us. We do not know what this reality is on the subatomic level. But we know that matter exists. This might sound trivial but is fundamental to the question of Being. The rock
is. The universe
is. They exist as concepts in our minds, but they also exist independent of our minds.
Now there can be different categories of being and degrees of interaction and relevancy between the different beings, for all of which Heidegger has coined different terms in an attempt to systematically structure these relations.
But when we take a deep breath and a step back from all the Seiendes, In-der-Welt-Seins and Zuhandenheiten, would we then not be able to divide the totality of all Being into:
I Being that was not created by humans:
1. Sub-atomic of which we know very little and where parallel states/realities seem to be possible to exist.
2. Atomic-> physical and chemical natural states and processes. They can be described well by conventional science and there are laws to be observed here which are seemingly universal
3. Biological. These are complex chemical processes which result in a self-perpetuating system with no fixed end
4. Biological with consciousness. Again we know very little about consciousness, but Heidegger knew even less and was trying to expand on the idea of phenomenology used to describe different states of mind/consciousness using his own categories. The status of current neurological research is that consciousness results out of the neural network that is our brain and can have different grades of complexity corresponding to the complexity of the network. At some degree of comlexity of the network there is a threshold to simple consciousness, then medium and advanced consciousness
II Being that can only result from consciousness:
5. Representational beings (Images). ie describing or conceptualizing about things that exist in the real word, eg our image of a flower or stone, when we talk about it
6. Phantastical beings and concepts like 'Mickey Mouse' or 'Nation' ie beings that are not existing in the real world outside of human brains and conventions
7. Man-made physical objects like houses that come to be part of the real world and some of which will still be there when no more human brains exist. They will then exist in the universe, even though there might be no more complex enough consciousness around to assign meaning and function to them
8. Virtual beings and simulations. They are created by humans, like phantastical beings, but they are able to make own decisions such as simple or complex computer programs, and are able to perpetuate themselves with no fixed end
And now comes the most fun part in all philosophy, whether this last point 8 is the only feasible answer to point 1 where it all could only have started? We do not know (yet).
Lastly let it be said that I like this forum full of intelligent people, and appreciate all answers I have received so far.