You know what, I'm not done, I have more thoughts.
I mentioned it briefly above, but another thing I love so much about both of these stories is how much of a role love plays in both stories.
Specifically platonic love.
I just greatly appreciate their motivation isn't boiled down to being for the love of a girl/boy but a focus on these connections that make us human. That these connections are shown to be worthwhile, worth dying for.
In LOTR, these platonic bonds are everywhere. Frodo wouldn't have gotten very far without Sam's love and support, and Sam's loyalty and endurance is connected back to his love of Frodo. What Merry and Pippin go through, they managed to because they hold on to each other and they were looking out for one another. Aragorn, Gimli and Legolas do the same as their branch as the story plays out - the bonds of fellowship, of friendship, pushing them to stick together and cooperate. There's connections outside the main groups too: the friendships of Merry and Eowyn, Merry and Théodin, Boromir and Aragorn, Merry, Pippin and Treebeard, Aragorn and the Dúnedain Rangers, Pippin and Beregond, Beregond and Faramir and so so so many more. And sure, in the fandom, some take these through a romantic lense (and, of course, you do you) but, for me, these are examples of what makes us human. Of pack-bonded with something and going: you're mine now and if anything were to happen to you, I'd kill everyone in the room and then myself. Just love that has nothing to do with physical beauty, blood relation or intimacy of the naked kind, but just care for the other as a person and for their well being. They throw themselves at times into terrible danger when these connections are at risk (Merry and Pippin vs Cave Troll, Sam during the final stretch of Mt. Doom, Boromir during the Uruk-hai raid...) to make sure the other(s) survive(s) - and live. And sure, the arguement could be made for duty, but I would argue in turn that while duty may be present (like with Beregond) it is ultimately love that pushes their actions to greater heights.
Ryland Grace's story is, of course, much more isolated but it is still his friendship that he builds with Rocky that saves both their planets in the end. It's the deep friendship he forges with Rocky that helps him find and keep his courage, to put his life on the line, even as his memories come back. Their friendship is what pushes Rocky to enter Ryland's oxygen-filled side of the ship and simultaneously catch fire and freeze while, shortly thereafter, Ryland repays the favour by hauling Rocky's incredibly heavy body up a ladder and instantly char himself and flash-burn his lungs. Ryland abandons his chance to go home and his future survival in order to go back for Rocky. The dialogue in the book goes pretty hard here:
"I can go home. I really can. I can return and spend the rest of my life as a hero... ...but then Rocky dies. And more important, Rocky's people die. Billions of them... ...So that's what I'm left with. Option 1: Go home a hero and save all of humanity. Option 2: Go to Erid, save an alien species, and starve to death shortly after... ...All I see when I close my eyes is Rocky's dumb carapace and his little arms always fidgeting with something." (P. 454-455)
Like he acknowledges what would happen to Rocky's planet if his friend is unable to get home and deliver the cure, but the book strongly implies that the reason that Ryland turns around is because of his friend! He can't stop thinking about him and is afraid of what would happen to him stranded in space. Rocky is what motivates him to turn around, not Erid itself!
Sure in both LOTR and PHM, the world was at stake, but humanity has a hard time grasping stakes that large. After all, as the infamous saying goes : "The death of one man is a tragedy, the death of millions is a statistic." These characters are so human because the insight we get into their thoughts show them concerned for the Shire, for their friends, for a beloved commander, for their families, for their people/culture - for the people in their lives they love - not so much focusing on Middle-Earth or Earth/Erid as a whole.
There is Good in the World. And itās Worth Fighting For.