Why no opening windows?
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Openable windows are quite a trivial thing to add, particularly after a product has been released. Not only do they require significant modelling/texture changes, and a small amount of code to go along with it, but they also require a rework of the sound set to ensure the sounds are all mixed correctly with windows open and closed.
In the case of the F28, the project's original scope was set long before openable windows became more common in MSFS, so the feature was never planned.
As with a lot of things, it all comes down to the allocation of resources for us. We looked at adding opening windows in the F28 v2 update, but we couldn't justify taking four developers off other projects to add them. Never say never, of course, and we do have this logged on our internal feature request tracker, but there are no plans to add them in the near future.
Mark - Just Flight