Abstolutely, there’s a great discussion about it here. I think if sections/macrospecies are distinct identifiable clades, people would be fascinated to learn that there’s more than “just dandelions”. It’s probably unnecessary to go further than that in most contexts.
What do you mean by a blinded trial? Would sending the same specimens to multiple experts and comparing their identifications count, for example? The paper I referenced above (Kirschner et al. 2016) has a test equivalent to that I think:
Four specialists collected achenes and usually also herbarium specimens of these species in six countries
…
Genetic analysis leads to the recognition of groups corresponding to species, with two exceptions out of 125 individuals (and one unclear case, see Discussion), and the accuracy of identification was nearly perfect, i.e. all the Taraxacum experts use the microspecies names in the same way and there is no identification bias associated with the person responsible for the determination.