Please people read carefully what i write! Don't use arguments which are no longer valid. For example, I already agreed, that once your character is created, his actions are real. Of course we are still restricted there a lot, since you can't have e.g. a house! A place which orginally served different purpose can't suddently change it. You can't make up stories about places, which already have their story (even lack of something special in a given time can't be erased! You can't claim something happened there, if it was otherwise).
And so there is a problem with everything before character was actually made. It is so problematic, that we make our stories as much placeless and theoretical, that we almost can feel fine with it, especially Idoru did it

Does this mean my character pop out from existence having no past life too?
Yes, that is logical conclussion. If we aren't allowed to create places ( if we could, there would be no problem to make a campfire in CS and let devs to put it in game), why is crafting a sword in setting?
It makes no sense we can do one and not another, but it leads to a conclussion that all what is possible through game features is in setting. Everything else is not.
I don't think so, Settings deal with the larger things, or "guilds" wouldn't even be allowed to exist. None of my formed guilds have histories of "glorious battles", they came from the ideals of a character with several life experiences and from the banding of people with equal ideas together, before that, it simply did not exist.
What "glorious battles"? what the heck are you talkig about? Read previous posts again.
About NPCs, well they are pretty much closed systems right now(Say keywords, do quest, get reward, ask questions), they won't change their behavior and what they talk about based on PCs actions, so the fact they don't say a word about any guild does not mean that those don't exist really and are just our inventions, but that they aren't smart enough to do it 
Given the fact, there is problem with making up places, or stories to already existing places, it is almost sure that what we talk about there, is not a problem with undeveloped game, but because you as character are permitted most of the stuff, which you normally would do.
Now if, as you claim, the official policy is to eventually dismiss all guilds as "outside the Settings", why are we allowed to do then so? Just to be frustated and leave Planeshift in masses? It simply doesn't make sense. It's just a question of not having yet the features that will allow "guilds" to really "put their mark" on the world beyond the perceptions of PCs, in my opinion.
Or it is because even though devs don't want to allow us everything, they still want us to have fun. Restricted, but still fun. Unfortunatelly it isn't working right

People get ennoyed by such approach and realise how much what they would like to do is impossible simply because of this damn OOC rule.
I realised it and i try to realise it to you, since noone will really take serious indyviduals like me. If the approach won't change, it will most likely lead to me leaving PS as a place restricting my will to RP.
Araye: Ok, stories passed by oral traditions. Why not books, monuments, something material? Because this way you are going outside the setting. Why the heck we need to be affraid of doing that stuff? Because we aren't really supposed to change the setting. I want to do what i want, RP.
Later you are talking about what your character actually did. Tell, if you assasinated the Octarch, would that be accepted? That is great you had a chance for these actions, but you had to play your role, keeping it from being too loose.
Idoru, hehe, of course one thing we are allowed is to have a belief, but you are feeling ok with it? Don't you never want to make an actual story? What is stopping you? hehe

The only guild post that I know well enough to make any definite statement about is Elemental Light's, and we made no bold claims about our history. Infact we actually toned down our true history to avoid mentioning the things that had actually happened. No point rakeing up bad memories.
Only your guild needs that
"things that had actually happened", Why couldn't you keep it? Was it outsoide the setting? ;P Why were you forced to make your guild placeless and theoretical assumptions so much? Don't you feel that your RP is restricted without a reason? Couldn't you talk about your story with devs to make it fit in setting? Edit it enough, that places will actually pop up, (just like the winch poped up for us lately), someting what will also make sense with the rest of the setting?
Why didn't you? eh.