Consider the Seigenthaler incident: the moment the bad PR started piling up, Jimbo rolled over and instantly banned anonymous page creation. Did this stop bad pages from being created? No. Did this harm the community? Yes. Was it done without consultation? Yes. Has it proven utterly useless and likely wouldn't've stopped the original page from being created? Yes. Did it destroy a valuable source of information for New Page patrollers? Yes.
Yet, it allowed Jimbo to face the press and bleat that Something Has Been Done. Flagged revs is much the same.