intense feelings of homesickness

[Confused]

You raise a good point, Ra did say something along the lines of: 3D bodies are not self sufficient (as apposed to 2D bodies) so that you would be forced to interact with others and depend on them. This density is based on interaction and compromise, so whinyness is inevitable for everyone, except some people are content with conforming to whichever society they're born into, and others (e.g. wanderers) are rather picky about how much positivity there is or isn't in their culture - because its easier to reach one's fuller potential when surrounded by people of the same polarity.

After some scratching, I was able to find the quote, which I think you alluded to -

19.12 Questioner: I will make a statement then of my understanding and ask you if I am correct. There is a, what I would call, physical catalyst operating at all times upon the entities in third density. I assume this operates approximately the same way in second density. It is a catalyst which acts through what we call pain and emotion. Is the primary reason for the weakening of the physical body and the elimination of body hair, etc. so that this catalyst would act more strongly upon the mind and therefore create the evolutionary process?

Ra: I am Ra. This is not entirely correct, although closely associated with the distortions of our understanding.

Consider, if you will, the tree for instance. It is self-sufficient. Consider, if you will, the third-density entity. It is self-sufficient only through difficulty and deprivation. It is difficult to learn alone for there is a built-in handicap, at once the great virtue and the great handicap of third density. That is the rational/intuitive mind.

Thus, the weakening of the physical vehicle, as you call it, was designed to distort entities towards a predisposition to deal with each other. Thus, the lessons which approach a knowing of love can be begun.

This catalyst then is shared between peoples as an important part of each self’s development as well as the experiences of the self in solitude and the synthesis of all experience through meditation. The quickest way to learn is to deal with other-selves. This is a much greater catalyst than dealing with the self. Dealing with the self without other-selves is akin to living without what you would call mirrors. Thus, the self cannot see the fruits of its being-ness. Thus, each may aid each by reflection. This is also a primary reason for the weakening of the physical vehicle, as you call the physical complex.

The thick veil of forgetting + careful design in creating weak physical bodies = greater opportunities for STS powers to make hay through institutions like organized economy (robbing away of leisure for the masses) , organized religion (creation of heavy karma through ignorance and false knowledge), nation states (hierarchical power), etc.