I was thinking of place firsts as well, but this seems like the biggest complicating factor. I can imagine a popular CV suggestion from another continent being removed and re-added over and over again, and that kind of thing might be common enough that it dominates the feed, distracting from genuine discoveries.
Now that I’m thinking along these lines, it would be nice if a warning comment came up when you submit the first ID of a species in a country/state-equivalent on a verifiable observation, similar to the warning when you submit a rare bird in eBird. I can imagine it would might be too expensive to run these filters on every ID submission though.
This is the first identification of [Reticulated Giraffe] in [Canada]. Please review and confirm that you want to make this identification.