I want to “hide” observations I never want to see again, so that I can have “reviewed” for things I might someday want to go through again later, such as after I’ve learned some new species characteristic.
Personally, I suspect that awards for numbers of IDs can result in some users treating making IDs as a numbers game… making IDs just to boost their ranking whether they really know the species or not. Just saying… such happens in most arenas where being prolific is recognized as a status in itself.