I liked the idea of having a feed of the GIS HNQs as I wasn't fully aware which of our questions ended up there, and it was nice to be able to identify them easily.
I liked it too (thanks). This is a pro.
Do you think you miss any interesting or important chat messages because the feed clogs the chat?
Yes. This is a con. Normally, a HNQ won't be a ...
I think a link to your Open Data question that seeks help from GIS users would be more appropriately posted in the GIS Chat Room because it is about a specific question from a Main site rather than being about the "workings and policies of GIS Stack Exchange".
I have taken the liberty of posting that Open Data question in our chat room already.