It is an understandable sentiment, but it is really not that easy and it's a consequence of simulations in general, I believe. For example, to incorporate even the very best FSX:SE aircraft into MSFS, would be like trying to put a 3d printed video game basketball, into an actual basketball game, or at least a very much more immersive simulation of one. You were able to believe your paper cut out FS9 airplane worked fine before, but if you saw it in MSFS, it would be exactly that.
I have been experimenting for weeks with the same importing algorithms and I have barely managed to include a unique VC, at this point. To put it bluntly, it is not a one to one conversion. The tools thus far provided are very good, hats off to the developers, but it is a "new ballfield," so to speak. What Hiroshi means to say, I think, is that it is simply more practical to start over.