JKS, I hate to say this but, Yes, the community 'cries' when the FPS drops. I am one of those 'babies' to which you refer. When the FPS drops too low, the game is unplayable. I guess you like playing a game that locks up whenever you try to move and cause lag in the game. The community also 'cries' about lag because they consider it cheating. I suggest you rethink this idea of calling the community a bunch of babies.
I agree with the elite guns. However, every time something is done with a building, ie: opening it up for exploration, the building has to be physically removed and then replaced. This causes the building to move. Even a small move of a building can cause problems. For example. If you have a building that has roof access and it is moved, even slightly, and there is a locker place on the edge, it is possible to lose access to that locker. This is detrimental to the game overall due to the fact that GI access lockers are placed permanently. If it's out of reach, it's worthless. I've even seen lockers get buried on top of a building when another item was placed. The new item covered the locker completely. Although you can still access a locker in this situation, it is still frustrating to see a locker you use appear to not be there.
This has been suggested many times in the past. As you already realize, having changing weather would place more stress on the engine. A good idea in theory? Yes. I'd love to see changing weather. Is it practical in this application? Highly unlikely.
Thanks and Have A Nice Day!!!