There are so many unidentifiable observations that need to be corrected with an upper rank ID. So, if it would always be necessary to explain why an upper rank ID is provided it would turn out to be relatively to highly time-demanding.
Definitively, it is mostly a matter of availability of time to provide an explanation but only when the observation is made up of sufficiently informative photos. Instead, if an explanation is asked, it is a matter of politeness to explain the reasons of the downgrading identification.
In other cases, I think it is up to the identifier to suggest the author of the observation to post more informative photos.
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