Yup the problem of real tracks in lfs is a big one. The thing is that if lfs includes models of real tracks like for example the nordschleif there will be comparisons between it's modeling of it and that of say GT4, which will get lfs nowhere, because Gran Turismo 4 had a fortune spent not only on rights to use the tracks, but also on modeling them with a prescision that's simply not possible for lfs to match. And also with such a track as the nordschleif there is going to be somebody who will moan endlessly about it if there is one corner slightly wrong, or a bump isn't done right, so it's really not worth it.
I think it is much better for the time being to have tracks that although fictional give lfs the chance for completely ideal track layouts with the best corners and the best changes in elevation.
In a posting on another thread I mentioned about a track based on a fictional road track using scottish highland A roads. I would say having read this thread that it would be better still to have the track as an idealised version of a road / race track. By doing that you'd have all you could want in that type of track, the different corners the changes in elevation, and the kind of track that would have been possible for an event 50 or 60 years ago, but todays safety concerns would never allow. But most importantly you'd have no comparisons being made with real tracks or roads.
In short I think it's much better that the developers play to the advantages lfs has in comparison to other racing "sims"
rant over.