For people with just some basic computer graphics background that don't know what this "deferred rendering" is: when this technique became popular, these [1] slides were popular and inspired many.
It even inspired a WWII plane game to use deferred rendering, which optimizes for having many lights on an object. Even tho they for the most part had only one light source (the sun)...
Many lights is not the only advantage. There are some deferred decalling techniques that I could see be very useful to a flight simulator for terrain drawing, for example.
I've been looking at the game engine 'Leadwerks', and impressed with what I see. Apparently uses deferred rendering. Means bigger environments and more lights possible from what I read. Good hardware is needed though as it eats VRAM. Beyond that, as a designer-dev, I suppose I don't need to know too many details about it.
https://www.youtube.com/watch?v=UuDPTw_j6zw (it's somewhere in this presentation, but I'm on mobile ATM)