Thankfully the earlier debate is now over, but I wanted to add the thought that FSX itself runs fine on modern hardware; just not when you add many of the latest add-ons to it, each of which when taken alone can push a modest system quite hard!
If you were to take any game that could be modded, which is all FSX is in effect, and then several years later added mods that were all far more detailed than the base game, you'd likely find yourself in a similar situation. I realise add-ons are more commonly expected for FS than for most other game genres, which is something the developers would take into account, but when it was designed the level of the add-ons wasn't as high as it is now. A2A have certainly pushed the envelope more than I ever expected, as have other developers in other areas (such as scenery).
If I had a high-end machine like you guys (I wish!) and threw the number of complex add-ons at it that you do, I'd be neither surprised it didn't all run perfectly with near-full detail, nor disappointed. As it is, my 3-year-old, £600 PC is doing a sterling job, even if the autogen is lower than I'd like it to be, but I have to live with that else I'd have to make do with reading books or something.
Ultimately we're all here to enjoy our hobby, no matter how we choose to balance detail against FPS. Searching for a few extra FPS is always something that's necessary with flight sims more so than any other type of game. I don't think that fact will change any time soon!