I know nothing about how Asobo operates so this might be totally inapplicable, but I’ll try to give you some general ideas on why opening up internals is not always a default option in software development.
Opening up anything requires a certain level of commitment on maintaining the interface to avoid breaking everyone relying on that interface when the internal system evolves. To a brand new and unstable infrastructure, that kind of maintenance can be a damning task. Changing becomes more and more difficult, tech debt piles up, and I have seen systems rejecting important upgrade simply because it affects interfaces.
Without interfaces, dev knows that everything is upgraded and tested as a whole. When you open up the internals, everything is a question mark.
Those issues are definitely not impossible problem to solve, but are not “free” to do either. Although there are a lot of best practices on designing a flexible interface, they all need a certain assumption on how the system will evolve in the future, and that again can be a very difficult task.
Then if your interface involves exposing data, there comes questions on licensing. Do you own the data? If not, does your license on the data include exposing to 3rd party?
With that kinds of additional effort and the small number of developers and products on weather, especially if you compare that with sceneries and aircraft, I don’t see it’s really a win for Asobo/MS to target this instead of fully focus on working with meteoblue (I hope I don’t offend weather dev here, I do enjoy both HiFi and REX’s products very much).
All in all, I do hope Asobo will open certain part of the weather system such as ATIS, but I would expect a huge number of votes before this can overweigh all additional effort. If you really want a single part of the weather system (e.g weather injection), I guess that a separate ticket on that particular item would be easier for Asobo to pickup.
P/S: also, REX releasing their product doesn’t help the situation. Asobo/MS can (and did) say that dev can still access weather system while not having to give any commitment. REX uses a hacky way to change weather so no support can be expected from Asobo/MS.