“microspecies” is not an “official” rank in plant taxonomy and there is not a rule to define a species a microspecies. As regards, whenever there is a sort of splitting inside a genus into a large number of species more or less all extremely similar one can think that they are microspecies. But they taxonomically have the same dignity as the other species. It is not even a matter of agamospermy or not.
Yes, it is unlikely that many of these microspecies will be identified in iNat unless a specialist won’t look after one user that will demonstrate to be willing to get more insight. For the other cases there are the sections as far as Taraxacum in concerned.
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