Seems to me the point of Flight Sim is to fly at a height lower than the wings are long.  That’s coming from a professional pilot!  When I started designing my aircraft, the last thing I thought was that I was going to be spending so much time at this game environment.  After all, “ya’ get enough of the real thing after a few years”.  Pilots go sailing to get a change of scenery.  But working on the model also means the thing needs to be loaded to test things out.  So I end up cranking it around some hillsides or mountain range while catching a few leaves from the taller trees.  Then I’ll walk away from the confuser, for dinner or other distraction, with the aircraft on auto pilot at FL450, at MACH 1.85 and unlimited fuel, come back a few hours later and “where the hell in the world is it now”, followed by “Dive” “Dive” “Dive” exploring the virtual world, and picking up a few more virtual leaves.   I find I simultaneously need to load Google Earth, and Wikipedia just to see what this new place (“where the hell is it now”) is all about.   Airliners don't give that kind of fredom - beleive me - I know.