Everyone that wants a lifesteal tank seems to forget that they are a pain in the ass to balance. If you give them enough lifesteal to really make a difference, they end up overpowered as hell long before the end of an expansion. If it's strong enough to be viable early expansion, it [B]will[B]be overpowered later.

Also, DRK trying to tank in FFXI only worked in some very niche circumstances. Even then, you needed some really pro healers to make it work. Did they have dreak spikes and drain spells that returned a good amount of hp? Yes they did. Could you spam those spells in order to make yourself a viable tank? No, you couldn't. They weren't meant to make DRK a viable tank. They were meant to mitigate the hate that healers had for DRK players. DRK had to trade hp for damage in FFXI. When you have a choice of two dps jobs that deal equal damage but one is an mp sponge, it's obvious which will be chosen.