Picture a client's monthly report with a Domain Rating column sitting next to Search Console clicks. DR drops from 34 to 31 and nobody can explain it, because that number comes from a third-party crawler index, not from Google. Search Console shows what actually happened in search: clicks, impressions, which pages moved.
My view is to take DR out of client reports and keep it in the internal prospecting sheet, where it's handy for filtering link targets. The counterpoint is that some clients buy on it and will ask about it anyway. In that case I'd show it with a footnote naming the source rather than as a KPI. How do you handle clients who insist on it?