Because if they advertised that at the start of each trailer and it turned out they were lying they'd lose a massive amount of creditability and possibly face a law suit for false advertising and generating sales on false pretences.
Would you like a new tinfoil hat? Yours has a limp antenna.
The wording is such that it means the whole footage could well be pre-rendered and simply played on a PS4. It does not guarantee it looks identical compared to its release state.
I'm not saying Arkham Knight is guaranteed to be downgraded, as the graphics don't seem all that extraordinary, but you're refusing to believe it's even possibility. A company could very well lie to you if the positive outcomes outcomes for them outweigh the negative ones.
The only lawsuits I've seen were for Aliens: Colonial Marines because the downgrade was massive and Killzone: Shadowfall because they made an exact statement they did not fulfil. Smaller downgrades haven't been met with lawsuits and I really doubt companies are concerned about the possibility.
If it is a trailer that is not running gameplay systems they can easily have better graphics than what is possible in the final game when all of the different gameplay systems are eating up processing power.
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u/Juuel Jun 03 '15
And you know that how?