The fact you act like an RTX3080 is a nothing dGPU!
The most common dGPU used by gamers is the RTX3060. I have an RTX3060TI and the most powerful Nvidia dGPU under £500,officially is still the RTX4060TI. The top20 cards on Steam are:
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According to TPU,the RX7800XT is in-between an RTX3070TI and RTX3080 in RT(an average of games):
The ASUS Radeon RX 7900 GRE TUF OC comes with a dual BIOS feature and a premium all-metal cooling solution that runs whisper-quiet. The TUF also offers adjustable RGB lighting, and cooling performance that's among the best of all the GRE cards that we've tested.
www.techpowerup.com
In the worse case scenario it is closer to an RTX3070 and in the best case scenario slightly better than an RTX3080.
That makes it beaten by 2,maybe 3 cards in the top20 on Steam for RT. So that means if you think an RX7800XT is too weak for RT,it means most of the Steam Top20 also is weak for RT too.
Considering Humbug really only buys sub £500 cards,and had an RTX2070 which was £400 beforehand I suspect their view of RT comes from only owning cheaper hardware.
They are on a tech forum,where apparently every gamer owns at least an RTX3080!