Tobzalp,
Not quite sure where you're coming from and but...
What about the 20nm "in-trail" standard that ATC apply before allowing descent thru each other's level?? Both aircraft are fitted with more accurate RNAV equipment than the shuttle. That is but one example of ridiculous separation standards which, if there were a few clouds about, would prevent me from descending in E airspace until over my destination. What a crock.
Yet another: two aircraft head to head: why in hell do we have to be at separated levels 10 minutes before crossing??
The thing that really gets up my nose is that, as soon as one of the aircraft goes into Class G, ATC says "see ya later" and they wipe their hands of the affair. Now I don't have anything against ATC (except their bosses that shafted FS), and I know they are merely applying the rules, but that's what happens. And, I might add, it'll be even worse in E down to lower levels.