Is address space the only reason we moved away from 32-bit for high-performance computers though? Does 64-bit have any performance advantages over 32-bit apart from that? What about SIMD performance?

Both the Snapdragon 8G1 and Exynos 2200 are trash in terms of efficiency. Like, yeah the Exynos is slightly worse cause Samsung sucks at SoC design, but they’re both made on Samsung Foundries’s 4 nm process, which downright sucks compared to TSMC’s 4 nm process