I'd take that trade if that was the actual deficit in RT, I don't want less than 16gb for a new card, the only ones that look remotely reasonable to me from nvidia are the 5070ti and the 5090. 5080 having 16gb is ridiculous, even worse than the 5070 having 12gb.
On that note, whatever happened to paying double for 30% more performance for the top end cards (or whatever, you get the idea), I don't get why they're scaling them linearly like this for the last couple of gens. The people who must have 'the best' are surely willing to pay a premium for the final few % of performance.