I appreciate the discussion, even if we disagree. :)
I want to clarify that this is NOT an American versus European thing at all - if all species of Sarcophaga were only found in the US, I would still want to get rid of this common name (but I won’t).
There are of course codified rules for nomenclatural stabiity in scientific names (which change regularly anyway), but I am not aware of rules for stability in common names. I don’t see the need to endlessly propagate misleading or hopelessly vague common names for the sake of stability. The scientific literature would certainly NOT be affected by changes in the common name at iNat (or anywhere else) and I seriously doubt anyone actually interested in this family would be confused at all - they just use the scientific names anyway.