I don't know. I think ignoring it would be less logical. I haven't read the whole thread and don't intend to but as I understand it, we're speaking of mages, and particularly WHM, in melee, yes?
The only situation where a WHM should outright NOT melee, is a situation where you have no one meleeing at all in the first place. And it's almost always a better idea to have a WHM meleeing than not. And even if AoE was an issue, a WHM/NIN will be safer from AoE than any other DD.