Apparently what I really wanted to play was Ghost of Yotei, which was originally supposed to be what I played over Christmas break, but I was distracted by ARC Raiders.
This game is unbelievably good looking and really makes the case for the PS5 Pro more so than any game previously, I think. The amount of plant matter on screen at any time is pretty staggering, definitely a 'generational improvement' over Ghost of Tsushima.
Compared to Assassin's Creed: Shadows, Ghost of Yotei has a very distinctive feel to it. Every bit of gameplay feels bespoke, from the combat down to the way the horse controls. It's somewhere approaching Red Dead Redemption 2 as far as physicality goes, though it doesn't go quite as far as that game.