Vafhudr: that's an interesting line of thought. But I wouldn't expect Sigrun to emote loudly or obviously, both for the reasons you state concerning how not only individuals but whole villages can disappear without warning, and death would be a constant part of their lives, but because their folk seem to have gone back culturally to their Nordic Pagan roots. Enough of the sagas and folktales from that culture would have been around in Year 0, perhaps especially in the Norwegian country areas, that the culture would have been pretty easy to reconstruct. It is possible, I think, to deduce the psychic edifice of a people quite thoroughly from their folktales, and that culture, while it accepted and understood strong emotion, did not encourage histrionics.
'Cattle die, kin die,
Every man is mortal.
The one thing that is never lost
Is the worth of a life lived well.'
That quote is from the Hávamál, as I'm sure you recognise. For those who don't, it's a collection of precepts and life advice from the earlier Nordic culture. The sagas suggest that they regarded stoicism in the face of adversity as a virtue, and tended to deal with death and loss by stubborn endurance and grim humour.
Whereas my own Celtic culture, from which comes the Táin, was much more given to open expression of emotion, often in formally ornate language because wordskill was at least as highly regarded as swordskill, and the compleat champion was expected to be able to win a battle and then compose a poem about it, or create extempore a blistering satire upon his enemies, but they still regarded toughness, coping and endurance as virtues.
And anent the 'homosocial' definition: another factor of the Celtic social structure was that women were prominent. Warriors were not invariably men - indeed Cuchullain and Ferdiad meet because they both went to the famous school of war in what is now Scotland, which was run by a trio of female warriors. The invading army in the Táin is actually that of a woman ruler, Medb or Maeve, who is considerably more badass, and far more aggressive than the Ulster king she is invading. She is still a woman: she has ten kids and a husband, but she was dangerous. Even today, people treat her grave with cautious respect. It is still traditional for visitors to bring a small stone to add to her mound, which is quite impressive.
Way back early in the Forum, there were some interesting discussions around these subjects, but I'm afraid I don't remember where. I do remember, though, that one of the participants was Laufey.