Denti :
Thanks for your detailed answers .I understand the demands and arbitration / compromise made, we do the same in France. There too the Military is now far better than it used to be, Flight Info(FIS) was decentralized to many Approaches ( exactly the opposite of what Germany wants to do btw ) and this works very well. Which is for me one of the key to airspace sharing .
When you have a good FIS ( like in Germany and France those last years) people will use it , and safety will drastically improve. I myself now always contact / listen to FIS when above 1500 ft. But most of my Gliders colleagues still don't , in both countries.