One of the biggest limiting factors for features like this is the fact that in its current state, Infinite Flight is still using OpenGL ES as the rendering API, and being an old and depreciated API there are limits to what it can do, especially on mobile.
It had been mentioned before on the Infinite Flight blog that hopefully in the future, this is something that will be added with the shift to Vulkan as the API. Vulkan is a lot more friendly towards devices due to its lower processing overhead, and just being a much newer and widely supported rendering API. Several desktop based games and simulators have made the transition and the performance difference is staggering.
Buildings, clouds, weather, better lighting…
All to come in the future ☺️