Finished the game. Sad thoughts and replays [Full spoilers]

Exactly this! I'm noticing now and it almost seems so obvious!  The way that no one ever spoke to Varric or even LOOKED at him... how did I never find that odd first time through?

I was spoiled with the Harding/Davrin choice, upon learning about this I set about finding out whether it meant Assan too...I still feel bad about sending Harding, but I couldn't watch the feathery baby die!  Had he survived then it would have been Davrin...

So, I was just thinking about something. I don't actually remember any characters using the term "Veilguard" throughout the game. It was definitely shown in the UI in various places, but otherwise I can't recall a character saying that term. Am I just forgetting?

Has anyone found a comprehensive guide about how faction reputation, companions being Hero of The Veilguard or not, and which roles they are assigned factor into what happens at the end? For example, if someone is a Hero can they still die (besides Harding/Davrin choice) if paired with a weak faction or in an improper role? If someone isn't a Hero, can they live if in proper role and/or with strong faction?

The solas hate feels good. Annoyed I ever considered his perspective.

Heroes can die if signed to improper roles. My third Rook assigned Lucanis to attack Juggernaut and it didn't end well.

They don't get their Plot Stamp unless you complete their quest lines, right? It's not a possibility of failing it's just whether you did them or not.

Then faction strength, 3 stars is needed to be considered full strength. Rank 4 is just for fun?

And then what job you assign them to is the third thing

Yeah I assigned Davrin for that and he lived

I replayed Act 3 with my rook from playthrough #3. All companions at Veilguard rank. All factions at 3 stars 
Ghilan'nain kills Harding
Emmrich went with jumpers. He is the one to disable the Venetori lock. Lives
Bellara dealt with the contruct. She uses her magic to have it swing it's weapon into the structure. Lives
Taash with the crows. Taash liked that. After the head mage was killed, Taash is made an honorary crow. Lives
Davrin helped Morrigan. He has a nice killing scene against an antaam. Lives
Neve did the wards. Taken by Elgar'nan. Lives. Because I romanced her, I got a romance scene after the ending
Lucanis lives

With what I've seen, it's safe to say if all factions are 3 stars and companions at Veilguard rank, all will survive. 

I'm currently doing a playthrough to do the least amount of stuff while having all companions survive. 

What I posted is true from what I've done in my playthroughs leading to the conclusion I came up with. 

I think how many goes with Bellara/Neve might impact if they survive at the end.

Fighting darkspawns outside the throne room would be my guess.