That is quite disappointing, but thanks for explaining it. It makes me feel like the current gaming GPU:s have poor performance when they cannot handle more than one light source that casts shadows.
In a game engine it can be decided which light sources are also casting shadows. Additionally the way lighting is being calculated can also be adjusted (like pixel or vertex lights), as well as the range. ED and most other game engines can render more than one light source, while maintaining enough performance to be playable.
There is also different techniques to draw shadows. So there is a lot of room for optimization.
Edit: Regarding graphics quality and lighting: You can make objective observations, but they don't necessarily align with subjectively perceived quality. You can have an aesthetically pleasing image, that is the opposite naturalistic. Sharp contrasts for instance can lead to subjectively increased picture quality. This is, what we can observe in the hangar screenshots of OP. At first glance EDH looks really good, with the pronounced ship lights and the omnipresent edge shadows. But if you analyse the scenes more thorough, you can notice the lighting and shadowing does not make much sense in EDH. The main light source in the hangar are the over head lights at the ceiling, but for some reason top side of the wings of the Orca have a shadow placed on them, same with most edges, that are exposed directly to the light source above. All in all the lighting in EDO in this scene is more natural than in EDH, yet EDH looks more interesting. FDev needed to adjust the lights (positions) in the hangar in order create a similar effect. Not sure, what their goal is there though. If they were to go for a realistic approach, they'd probably want to add some light(s) below the ship, like in a workshop, so the ship can be examined properly.
