I see this mentioned occasionally, so let me ask: How many people would be interested in an actual forum (not just Discord) to discuss #WebXR, whether that be showing projects or getting WebXR-specific help? I own http://webxr.community and I'm thinking about using it for that.
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One of the most common complaints I read about Discord is that it makes it much harder to search for relevant conversations that have already happened, which I do have to agree with (Discord's search is decent but not amazing).
The ideal solution would perhaps be the ability to export useful debugging tips that happened in realtime on Discord to live on the forum too, where it can be more easily indexed and searchable to others in the future, regardless of whether they're on Discord or not.