I just got this laptop (Asus TUF A15 2021) today and it surprised me that everything works just fine out of the box on Vanilla Arch, except NVIDIA gpu I had to install it manually on battery power that's why I enable powersaving mode. As for games performance it's basically the same as windows no more no less.
Running arch as well and have it installed. Works just fine with linux-g14 kernel and headers. I use the zen kernel mostly so i don't have the armory settings most of the time because I use zen but everything else works.
Just did a pacman -Q | grep linux and my linux-g14 is on 6.15.2 and zen is on 6.15.3.
Did you add the keys?