The sim flight model (atmosphere) is a completely different thing than the aircraft model it self. The sim flight model (atmosphere) needs to work with every single aircraft. A small paper plane should be able to fly in the sim atmosphere but because it has less mass it is affected more of the turbulence. Then if the turbulence is accurate modeled i’m 100% sure is not. Will never be in a flight simulator. Can it be improved? For sure it can be improved. CFD is the way to go to have it simulated correct. Especially if they using LES-model in the future. But LES-model requires much CPU-power especially to run in real time that it needs to in a flight simulator.
In my opinion the atmosphere/air behaviour has improved much since release. The atmosphere feels much more alive. Continue the work on improving the atmosphere Asobo 
Asobo said in latest q&a that they working on a full CFD simulation. If you turn on aircraft CFD then you see what they working on.