I think more than ten photos for an observation is likely not necessary, and uploading excessive photos can affect iNat’s infrastructure. It’s also important to remember that computer vision isn’t being trained to recognize an actual taxon, it’s is being trained to recognize iNaturalist photos of that taxon. You could upload a ton of macro photos of a tiny identifying feature (which is useful for humans trying to ID the fly), but will most other users take similar photos of that same feature? Probably not, so the AI wouldn’t be particularly helpful there.
I’m not sure if you read our recent blog post about the vision model, but we train the model only twice a year, so even if a taxon reaches that threshold, it can be months before a new model trained on that taxon is released.