Wall Lights, Wall Power Nodes, Wall Thermal Regulators

The problem is more that the lights are objects, which can be broken by taking damage. Systems are built up in the code to react to various events, like objects reacting to turret fire etc. Having to start to create exceptions, like having
indestructible things starts causing problems with well, will the player accept that a light gets blasted with a missile and it does nothing, and is it worth all the work of adding the exception and testing it all works

Everything is so tied together, that what might seem like a simple thing is not that simple. The path needs to be clear for the AI to reach the object and be able to repair it if it gets destroyed, without the player having to build everything up again, place objects etc.

Perhaps something can be done in the future, but compare Space Haven with Spacebase DF-9 and you'll quickly realize how much more freedom there is in Space Haven, and that there were big problems those Spacebase DF-9 developers were facing too, and decided to add a tile around the whole object as space to ensure paths are open.