Extreme Realistic Scenery

The best detail you're going to get is Payware airports by ORBX. Remember GTA quality is from a million dollar company that pays top designers. That level of detail is unnecessary for a flight sim. It would produce very bad performance, since those models are designed to run on a different engine. I understand what you are looking for, but that's not how these sceneries work for flight sims.

What you are looking for is called MSFS.

There are plenty of weeds and twigs in add-on Monterey. I would have preferred to have seen better building roof colour and shading variation, it would be visible during actual flying, the bit I enjoy the most. A blanket of more or less cloned colour is unconvincing.