I am missing something here, the 2070 super is an additional £100, it is about on par with the VII, ray tracing really isn't usable especially at 4k with this card.
There isn't anything that really pushes the 2070S to be that far ahead of the 5700XT which is only about 10% behind on average with new drivers etc.
The image sharpening from AMD at the moment at least seems more beneficial. I would expect to see the 5700XT to close the gap slightly as things are worked out such as under-volting the card to allow it to clock better.
Reviews generally been hitting thermal limits as haven't done this so even that should pull the 2070S within 5%.
The super cards for price/performance seem really lack lustre in reviews :/
Edit:
https://www.techspot.com/review/1870-amd-radeon-rx-5700/
This even shows the difference I mean, and sometimes the 5700XT is already on top of the 2070 super. Not as often of course but that is a lot closer than people here seem to be suggesting.
Forza, New Dawn, BFV, WWZ, all show for instance the 5700XT above the 2070S. And surprisingly for what people been calling space heaters etc it drawers less power, only just but hey. If as mentioned above people spend some time with them then they seem formidable cards.
Edit 2: Sorry it is only 4% slower on average as per this: