No. We have a continuum of examples connecting almost all distinction we draw. The existence of continuums is not evidence against the supreme usefulness of i

No. We have a continuum of examples connecting almost all distinction we draw. The existence of continuums is not evidence against the supreme usefulness of identifying extremely bimodal distributions. Ring species do not negate the meaningfulness of species. "Number of parts replaced" interpolates between restorations and original, but it doesn't invalidate the distinction. Hypothetical time-traveling vikings does not invalidate the distinction between "original", as the word is commonly understood, and "original", as you've insisted it should be used.