There’s one other common use of “No, it’s as good as can be” that sounds like it does not apply to your situation, but I’ll include it here for completeness.
The last common use of “No, it’s as good as can be” is when an observer has created an observation using photos of multiple species. The iNaturalist definition of an observation requires it contain only one species. However, new users especially often don’t know that, and instead create one observation per location, using a large pool of photos showing a mixture of organisms. The polite thing to do is to ask the observer to split the photos up into separate observations (I provide the link to my own tutorial on how to do that) but many times the observer either can’t be bothered, or they’ve gone inactive entirely. In those cases, identifiers put a high level ID that encompasses all the organisms, and then check “No, it’s as good as can be” to make the observation go casual grade.