You are free to use the definition you like. I like mine.
I just mean per the rules. They talk about TN as a philosophy that acknowledges both G&E, a refusal to see or judge them, and an inability to comprehend them.
These views aren't really compatible, so they're really separate definitions ftmp. Unless you think that all druids are unreasoning animals.
They don't care since they refuse to favor one side or the other. There is no possibility for concern.
When you don't want a side to cease to exist and will even fight for them to stay alive, it can only be described as concern.
I cited the neutrality for law/chaos not the one for good/evil. However, with the good/evil it clearly supports my statement that true neutrals do not care about others. They have no morality on the moral scale. This only reinforces my statement that they are adherents to Objectivism.
What you cited also applies in general. The philosophy of opposites existing is universal, and requires one to both care about it and have the capacity to do so. See the PHB definition for TN I will post later in this post.
All that matters is their cold, hard rationalism and reason.
Animals don't have reason. They have instinct. And it's precisely the refusal to reason about good or evil that makes one TN under this definition, but it conflicts with this one:
Philosophers of neutrality not only presuppose the existence of opposites, but they also theorize that the universe would vanish should one opposite completely destroy the other (since nothing can exist without its opposite).
This definition presupposes
all opposites, whether good or evil, law or chaos.
You can't fight to preserve two sides if you refuse to acknowledge their existence or reason between the two of them, and you can't really do anything other than survive and eat if you're an animal with no reasoning at all.
Again PHB:
True neutrals do their best to avoid siding with the forces of either good or evil, law or chaos. It is their duty to see that all of these forces remain in balanced contention.
So this philosophical approach applies both to the Good and Evil definition, as well as the Law and Chaos one.
PHB example:
True neutral characters sometimes find themselves forced into rather peculiar alliances. To a great extent, they are compelled to side with the underdog in any given situation, sometimes even changing sides as the previous loser
becomes the winner. A true neutral druid might join the local barony to put down a tribe of evil gnolls, only to drop out or switch sides when the gnolls were brought to the brink of destruction. He would seek to prevent either side from becoming too powerful. Clearly, there are very few true neutral characters in the world.
I think only a philosopher type of TN could act like this. The one who doesn't care about good or evil probably wouldn't want to be involved at all, and an animal would obviously not be fighting on anyone's side either. Only the druid or similar philosopher cares about the balance of forces here.
For this reason, I believe the definitions are not really one, but three, even if that isn't explicitly spelled out, and if the main definition tries to combine them to a degree.