Its more just the difficulty that Lost Island hardmode seems to be scaled to.
I would not want to attempt Lost Island hardmode with people in still mostly Columi. Loot progression should allow people to gear up for a hardmode flashpoint by using other hardmode flastpoint loot drops.
Done Lost Island recently? 3 months ago I would have agreed completely. But something's been changed in that operation between then and now (don't know if it's the soft enrage timers, or if there's more time to move or what, but it's different). It's easily puggable in columi at this point...long as the tank knows what to do.