Important?
i couldn't explain the situation with better words than the one of In Exile
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The Calling bit is just a plot coupon Bioware introduced to address what would otherwise have been the borderline aggressive complaint about what the HOF would be doing during DA:I. This is the (parody version) of the conversation Bioware wanted to avoid:
Warden Fan: Where is the HOF during DA:I? My HOF is a superlative badass titant warrior/rogue/mage murder god of killing. She/he'd kill Corypheus in a heartbeat, wear his spine like a belt, use his teeth to make cornmeal, and be back home before supper to rule Ferelden/hang with Zevran/party with Leliana/raise Kieran/build sand castles with Alistair.
Bioware: Err... Calling!
Warden Fan: What?
Bioware: Curing the Calling. Yes. That's it. The Warden is off to cure the Calling!
Bioware: Far away. Yes. Really far. Over there. Which isn't here. It's so over there that the Warden can't get right hereuntil way after the plot is over. Yup. Whew.
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and my warden do not like to write lovely letters.... the letters were wrote by a bioware writer and i will just pretend that it's never happen.
And that's your viewpoint. Mine is that the Calling is a serious issue, even if it is a plot coupon. Because I'm not obsessively attached to my Warden and am content to let her go (not that I wouldn't be happy to see her again), I'm okay with getting a nod and an update about what she's doing, particularly if my HoF is doing something that I can accept as being a worthy goal to work towards.
What else should they have done? Try to force a character in where he/she doesn't belong just because some people are overly attached to their Wardens to the point that they keep trying to get a whole game/DLC built around a character who doesn't have any real, legitimate reason to show up again? Is the HoF - who is just a Warden - supposed to show up as the hero now and forever? This is the Dragon Age, not the Hero of Ferelden Age.
Look, unless the timetable for the next Blight gets moved up thanks to Solas doing something extraordinarily wacky, I don't really see a role for the HoF at all now - with the exception of that Weisshaupt situation as I said earlier. They set things up in DA:O in a way, unfortunately or fortunately (depending on how one feels about it), where the HoF can be alive or dead; and if they're alive, you have other variables like her being queen or a mistress, etc. that would have to be dealt with.
As a result, the writers have a complex situation where they're never going to be able to satisfy everyone (short of them caving and creating a game featuring the Warden just because *rolleyes*). The fact that one person is okay with the letter and another person is not okay with the damned letter just goes to show that no matter what they do, they'll never make everyone happy - never, ever, ever - with regards to the Warden.
As for what the HoF is currently doing (if alive), sometimes things that seem minor at first (like, say, Flemeth) actually turn out to have a major impact down the line - whether or not this search for a cure to the Calling turns out to be one of those things, who knows; I wouldn't entirely discount it at this point. Oh yes, regarding your example using Corypheus in that other post, I disagree that he was like other characters who could be alive/not alive with death not being final, yadda yadda.
2)Corypheus is he really dead in DAII? No because magister.
Is he dead in DAI? I wouldn't be surprised to see him again because he was banished into the fade
(no.... he is dead the Inquisitor have opened a breach inside him.........still i'm sceptical)
If you go back and look at the final scene in Legacy, it sort of screamed "Hey, unless you're totally oblivious, this guy probably jumped bodies somehow!" At the time that I actually played it, I was pretty sure that something fishy was going on after the final scene and thought it left an opening for Cory to come back in some capacity. That being said, I certainly hadn't anticipated him being the major villain in DA:I. As for Cory's fate this time around, I think he's pretty darned dead because the Inquisitor kills the dragon that was functioning as his horcrux.
And as others have pointed out, the deal lately seems to be that characters who can die stay dead if you killed them/were responsible for their deaths. I sure haven't seen Bethany Hawke miraculously pop up anywhere after she ate it in DA2. There are always going to be characters in any game or book that have plot armor or that won't die just because the author says so (or who magically survive what seems like certain death). I'm mostly accepting of the fact that it does happen and will probably happen once in a while in a game, mainly because a game is more complicated than a book where you don't really have to deal with people making choices x, y, z (unless you're doing one of those choose-your-own-adventure books).