It would be nice if it was much easier to post models to the forum for others to see and edit, similar to how you can post an image.
For example, here are a few recent posts (1 2 3 4) where instead of the models being posted just a screenshot was used. This sometimes makes it more difficult to fix the problem, because to have to reproduce it first. While I think it's possible to attach f3d files now, it could be a lot easier, maybe a file picker that looks through the designs you have available.
Plus the kind of help you can get is more concrete, both from other users and support folks. Here are a few recent examples (1 2 3 4 5). Some of those would have been very difficult to troubleshoot from just pictures, nevermind providing actionable advice. But if you can edit the model and post it back, it's easier for us to help each other out.
What would be super cool would be adding images of the model that are taken from the f3d file automatically, or even embedding a live 3d view of the model..