Just because the skills arn't optimal to use most of the time doesn't mean they don't have uses. Clemency and Vercure were invaluable in side content like deep dungeons and POTD, so you effectively gimp those jobs in that content going forward by removing it. Spells like vercure are also fun for messing around, me and some friends like to do ex roulletes with unorthadox job comps for a laugh, and 4rdms can clear ex dungeons in good time thanks to vercure