Why do some genera have so many species?

I’d appreciate the elevation of the different subgenera to genus level.
iNat lacks the taxon levels necessary to specify taxa below subgenus and the situation with Drosophila is the main reason why I support this feature request: There are some cosmopolitan species, quite often observed, easy to narrow down to 2-3 related species belonging to one species group, but as this taxon is not available, when IDing these observations I have to select the next-higher category which comprises >1,000 species

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