But that demo is still used for marketing. It was made for marketing.
I am not sure you understand how important marketing is for a product's success and how it actually works while the product is still in development. The God of War gameplay example is a perfect one. I watched that Raising Kratos doc.So they worked a full year for a demo? I say use that one year to work on the game itself and not for something to show off as part of marketing. Leave the marketing to the marketing department.
While you may be right in saying they worked a full year on a demo, which was like 20 minutes of gameplay. But that 20 minutes demonstration to the mass gaming audience cemented thier confidence and the assurance that they were on the right track, and their consumers wanted exactly what they were offering. The super positive feedback they got from just a small chunk of "marketing" demo, helped them spend the rest of the 12 months making an awesome game they already knew the consumer wanted and liked...
On the flip side, see the new live action Sonic movie trailer for "marketing" that helped the film makers better (in this case scrap) their product to meet their customer's demands and thus (in Sonic's case at least try to...) succeed in making a movie that people want to actually pay money and see.
In both of these examples, marketing (trailer and game demo) played a huge roll in making these products what they are or what they potentially will be.
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