It's very imprecise.  Worse, it's only useful for individuals who contribute large amounts of hashrate, i.e. those who could reasonably solo mine.  nostr:nprofile1qqsvvk9qy7qx2gzed6wazxtureunuxljam66za6yr3p02zc0qhz57jqpzemhxue69uhk2er9dchxummnw3ezumrpdejz7qgcwaehxw309ahx7um5wghxvmt59emkj73wvf5h5tcpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhs0dsl3l makes the point that the difficulty of preventing block withholding could be a significant contributor to limiting pool options: https://mailing-list.bitcoindevs.xyz/bitcoindev/Zp%2FGADXa8J146Qqn@erisian.com.au/