Except you don't know how much of the content is being added, nor whether it was "cut" from development or not. I glitched into the Jovian Complex and the Terminus, and it looked like crap. No enemies, textures half-loading, plenty of areas where you could just fall out of the map... They have likely been adding placeholders to the game since it's release in preparation for the unfinished expansions. This way, less data needs to be downloaded and added once the expansion is released. Less data to download = less stress on servers = fewer players unable to download the expansion.
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The textures look fine for the most part in most of the levels, of which there's several, either way any important area within the level has perfect texturing. If I glitched into phogoth's chambers I'm sure no enemies would spawn either, that doesn't really mean the level isn't finished. Terminus looks just like the trailer, which would only really show off finished content right? I mean you don't put a half textured area in your release trailers. And just because kill barriers aren't set up again that doesn't mean it's not finished. Outside of that when has XBL or PSN crashed from too many people trying to download a DLC? Seems a pretty shitty justification, it's not like downloading the DLC would make things more problematic for Bungie.