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For two reasons. First of all, dots are more mana efficient than nukes. The less nukes cast, the less you have to lifetap mana back, the less your healer has to heal you.
But more than that, it seems like a build with a more offensive mindset. As SL/SL, typically you dot everything up and concentrate on fearing, LoSing, etc. both to relieve pressure from your healer by mitigating damage and to provide your healer opportunities to drink. With this build, you'd dot up your opponents and then have to spend time nuking just to make up the DPS loss from not getting Improved Curse of Agony and Empowered Corruption.
If you're nuking then you're not spending time fearing and you have to stay in LoS. Because you have to stand still and cast to maintain an appreciable amount of DPS you give up a lot of mobility that is one of a Warlock's strengths.
Intensity + Shadowburn do allow for some nice controllable burst damage that an SL/SL build does not offer. What you give up is the consistent pressure awarded by affliction talents that would get your opponents in to a situation where you want that controllable burst available. I don't think that's worth it for an outlast build, but depending on your play style it might work for you.
On the other hand, having survivability with greater, controllable burst does seem ideal for a double DPS setup.
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