I believe the original rationale behind this “VFR Night requires ATC” is the military Night Low Flying System and the desire to keep VFR pilots away from it (GPS didn’t exist when the rules were drawn up). I once had a map of the NLFS routes, it’s basically between TACANs and spans quite a bit of airspace. IIRC, one route was going by EDTY. You also find a note in several IAPs in Germany saying something like “not available during activation of NLFS”.
However, I have never seen any military activity myself. They barely fly during daytime, why should they do so at night?
Not enough carrots to go round… 
Actually, I just checked the Jeppesen charts for EDTY. All 3 approaches (ILS 28, RNAV 28, RNAV 10) say “Procedure not to be used during activity of Night Low Flying System (NLFS)”. One of their racetracks goes by the aerodrome.
Going supersonic at 500ft AGL at night must be a lot of fun :)
