The title is self explanatory, I know MS wants to limit the career planes to the store only, to “ensure a balanced gameplay” but one way that this could be achieved would be to have some sort of free download pack available at the marketplace including ONLY the files for it to be available at career
for example, if you bought the Fenix A32x family, the iniBuilds A300 or maybe the Leonardo Maddog, those are outside the MS Marketplace, therefore unusable at career. one way to have these working and still enforcing the marketplace career could be to allow such developers to add a free download from the marketplace with just the files needed for career, nothing else, with the assets and everything else outside being referenced by the career files.
not only would this allow excellent planes from outside of the marketplace, but would allow freewares as well (like the Headwinds A339, FBW A380 and others) once these come out, and wouldn’t be a network strain, since these files would be local, rather than streamed