1. Yes Cat8 is the highest rated cabling but guess what - Gigabit Ethernet has been around for a long time (~1998) and only in 2027 is it projected to overtake 100 Mbps. See https://www.lightwaveonline.com/home/article/14302651/gigabit-ethernet-service-adoption-continues-to-rise. It will be a long time before 10G interfaces become the norm in home networks.
2. I agree that Wi-Fi is excellent, but there are some audiophiles who insist on wired connections nonetheless. (I use a mesh Wi-Fi setup myself.) However, my Wi-Fi 6 mesh node negotiates a ~2.9 Gbps link with the base station for the dedicated wireless backhaul. This is about 30% of the theoretical maximum. I bet Wi-Fi 7 setups will struggle to reach speeds beyond 10 Gbps. Most likely copper will still be the way to go if you want maximum throughput at reasonable cost.