Well, I have only used HL2 [first time I used a half life product] so I can't tell the difference.
We can argue all we want, but the decision ultimately rests with the entire FS community. And don't forget that majorities rule in any vote. If 40,000 members [out of 50,000] in a community support the old engine, then the remaining 10,000 are out of luck and they will have to get use to it because M$ will always follow the ideas of the majority due to popularity.
Just because a few member [out of 50,000] don't like the old-style engine doesn't mean that the rest of the members of the community have to comply.
Therefore, as of right now, this arguement about changing the game engine is over. If you like X-Plane better, then go use it and stop whining about FS.
Believe me almost ALL add on developers, especially payware aircrafts wants a MORE advanced engine. Because the teams of PMDG, LDS etc cannot push the limitations of the engines further, because they are already there.
So you may want to get out of this argument which is fine, but you are certainly not correct about your statement. The comminuty is craving for a new engine, and many will be very disappointed if it's justa revamped FS2002 engine - yet again.