Physics are a moot point without an environmental simulation.
In the real world there is no such thing as as a perfect setup or a perfect lap. Conditions constantly evolve lap by lap and hour by hour. A perfect setup at midday can be half a second off the pace in the evening.
This is why the push for better tyre physics has never really interested me. I would be more interested in a Donington style airport next to Blackwood, or some greasy corners under overhanging trees at Fern Bay.
The problem with a static environment like LFS is that it is possible to achieve "perfection by repetition" and for me this in no way reflects the reality of doing a days racing.
Weather and localised environmental factors mostly come hand in hand with the ability to represent them in the graphical engine. There should be a local nuance to every circuit - Aston feels exposed and should be windy, Westhill is supposed to be on a hill in Britain and so should be exposed to the elements. South city should have drain covers and tarmac patches that affect the grip differently in different conditions - and the conditions should always be evolving.
This is what a simulation needs to be. All sims seem to focus on tyres and I've never felt that LFS was lacking in this department, environment always gets overlooked.
The aerodynamics model in LFS has always been the weaker, go look at downforce cars at club racing and you'll note that the cars in each train of cars generally follow each other at more or less the same distance apart.