Eric Anondson said:Something which the fansites can do which other "official" producers of material can't do (and often seemed not to care about as they cycled through new authors again and again) is reconcile differences. Dark Sun's publishing history is a lengthy list of conflicts of "fact". Athas.org can, and has, worked out wrinkles like this.
Eric Anondson (pseudo-retired Athas.org stiff)
And those decisions were some of those turned some individuals away from athas.org. Not myself mind you, just one of the most common complaints I've seen.
Although, I think it's mostly something that they don't care to do. Unless you're refering specifically to "Dead Worlds" (that aren't supported by WotC directly). The intent of Beyond the Prism Pentad was mostly a reconcile attempt, but I think I see your point, looking at PGF and the new Cosmology I don't see any attempt to resolve some of the other FR canon in those regards.