I personally love the tracks in LFS. They have all the things that make up good tracks, and I couldn't have asked for more variety. It's all there, thank you.
But... I'm basically a league admin. I started SCORE with the single purpose to run leagues which simulated what the real drivers do in real life. I've run several series on SCORE with the same tracks, on the same dates, with the same cars as they do in real life.
FIA-GT and ALMS, have done them both. ETCC, sure, it was a blast. Last year, we had a super huge series (22 races) with combined FIA-GT and ALMS schedules, plus the two classics, Daytona 24 and LeMans 24. You see, people like me (and there are a few) like the feeling of being "there".
So... While the track that ships with LFS are some of the best I've ever seen, they can never deliver the feeling of being there, which means I can not create a FIA-GT or WTCC series. And it all comes down to the tracks. The cars are not that important, since I've seen cars painted like everything from Renaault 5's to Aston Martin DBR 9's. Beautifully done, I might add.
So... Please, let modders do tracks at least. No way no one could argue with that if they are released for free by third party modders. And those who think that quality might suffer from this, well that's easy solved, really. No track gets released until the dev's have OK'd it. I see the community respect their wishes now, and I don't think that would change with tracks.