In addition to ranged mobs being a PITA to deal with, I would also love having such an ability for situations where someone else pulls aggro (or I miss one mob in a group with my aoe) and reacts by running away (though I guess I could just refuse to shield lob until they learn to bring it closer where all my best enmity works). Another pet peeve of mine before aggro was made easier was positioning mobs. If I need to get the add to the other end of the arena to avoid a wipe but the dps was ripping damage too much for shield lob to keep up I got pissed real fast. I guess these days I don't really need vacuum that much but man, back in ARR I would have killed for that. I still get pissy doing Garuda EX or Ancients Maze preemptively.