They mod a default aircraft. You can hardly expect the owner to help. Developers with a certain reputation like A2A, PMDG, even Aerosoft have praised the communication. They enjoy to work with Asobo.
The problem the early 3rd party devs have is that they released to a very early version. They knew it and released anyway. Of course things change. And of course these big changes break addons. If we want improvments we have to expect and deal with changes. If we prefer a stable simulator we have to deal with a fact that it has been dropped. Only then it will remain in its current state. A sim that‘s constantly to be improved WILL change and WILL break its addons. That‘s natural. Anything else can‘t be the goal.