This opens up possibilities of satellites performing switching functions from space. Dirty mirrors in the sky' is how some people describe satellites. These are non-trivial operations, and it makes sense to keep as much complexity on Earth where it is easier to support and maintain these complex systems.
Space is a remarkably hostile environment.
There are extremes of temperature fluctuations depending on the satellite's position relative to the sun, and a high level of cosmic radiation. Furthermore, optical coupling techniques and beacon-laser technologies are being studied.