I doubt anyone will actually read all of this.
I read it! But, I doubt I'll get to commenting meaningfully as you're writing more than I can digest at the moment.
Suffice it to say, your thoughts are compelling, and you're not alone in some of these existential struggles.
To me, death is just the natural degeneration of a wildly complex chemical reaction that eventually runs out of inputs and buffers needed to perpetuate itself. It is no more or less meaningful than that. Life has no purpose or goal, as far as I can tell -- even the "purpose" of reproduction is vacuous at best -- saying we exist to replicate our DNA is circular. I've come to the conclusion (not based on any study on my part, just stoned shower thoughts...) that we are, essentially, a reaction to incoming energy from the sun. As materials absorb energy, they have to "handle" that energy somehow. One solution is to use that energy to build more complex structures, and once you start down that road, you can eventually end up at "life". With no purpose in life, might as well enjoy what you can without unduly making things worse for others. At least, that's my current philosophy. It's probably pretty naive.
I'm looking forward to these Hadza videos. Thanks for linking to them. And thanks for your continued updates. I'm getting value from them.
Have a great day!