One thing that's probably worth noting is that all 5600 XTs currently available for sale will perform at least 10% slower out of the box than the results shown here, as they all include the old BIOS, since AMD didn't make that last-minute change until after they shipped to retailers.
So, unless one performs a BIOS update on the card, they are going to be missing out on a lot of performance, at least until new stock starts shipping with the new BIOS. And I suspect most people are not going to be flashing the BIOS of their card, as that's not normally a thing you do with a new graphics card, and is not without risk. Is the card even going to be covered if someone bricks it during the flashing process? Also, as I understand it, the new BIOS only applies to OC models, so models shipping at stock clocks may not receive a BIOS update to the higher clocks, effectively making two versions of the 5600 XT with a 10%+ performance difference between them. It won't be clear which is which just from the product names, and even the OC models may potentially come with the original, substantially slower BIOS, as that's what they all currently use. That certainly makes for a messy launch, and should have probably been mentioned in the review.
This review really should have included performance data for the original BIOS (that comes on the card), which is something the other 5600 XT reviews I've seen so far have done. It seems a bit bizarre that it wouldn't be included in the review, as this is not the kind of performance people will be getting from one of these cards right now, at least without flashing the card's BIOS.