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Same reason I'd suggest people do the same with any product release, we've been shown marketing material, not independent test data. I'm sure AMD won't have lied, but they'll have put their best foot forward. If the cards are great (and the marketing suggests as much), then give us a day to see independent reviews, find a review that matches our system and gives us the information needed for an informed decision. I mean I'd be annoyed if I bought an RX6900XT to discover that my processor bottlenecks it in my preferred games such that I might have just bought a RX6800X, or maybe if I realised too late I needed the RX6900XT to get enough horsepower for certain games at 4k, but I've already bought an RX6800X.