Then if no one is suggesting that only external flight models should be used, why do people keep talking about this as if this is the only suggestion being made?
And the only reason you don’t see it as a solution is because you’re not thinking openly enough. We have heard from lots of people (I think from Mat as well, if i’m not mistaken) that the goal is for developers to help out with the flight model, rather than creating private code that they keep to themselves. As such, has anyone considering open sourcing the flight model? Or, at least, making the code available to 3rd party developers under a licence or NDA? That way, developers can take the code, change it to fit their needs exactly, and then feeding back those changes to Asobo who can use them to better inform their development effort?
You have so many incredibly talented developers out there that have made it their livelihood to develop hyper realistic flight models. Give them a chance to help you.