Can't use trusts or NPC fellow under sync can you? Going to old zones solo would likely be slower trying to accomplish your goals than it would be to use trusts in areas you can use now. While I like the idea overall, I think the downsides would wear off rather quickly for people. Job abilites/spells you've come to rely on may not be accessible anymore, and as we all know synced gear really isn't that good if you want to do something other than leech.