Not overly fussed TBH, Weather doesn't really float my boat, can't think of a single game where its actually added anything to the racing experiance, rather than just lessen the grip, likewise for night racing.
Rallying, well, if I want a rally sim, I'll buy a rally sim, tarmac is where its at for me, so again, not bothered.
Tyre simulation looks very interesting in some of the latest videos, looks like someone other than the LFS devs realises the importance of proper tyre physics.