Presumably Hawk/(Arrow?) + 5070 Ti/5080 would be much faster in games (and although also very pricey) comparable in price.
For gaming, yes, but you'd be sacrificing significant performance on the CPU side, so not really a comparable configuration. In terms of cost, total die size would be equal but you'd still have all of the additional costs I mentioned before for the discrete solution, so I'm pretty confident Strix Halo would be noticeably cheaper.