So what is depth and give me examples? Because to me it sounds like you're basically cherry picking examples of depth and basically relegating "depth" to gadgets/abilities/loadouts. You completely ignored Horizon's myriad of depth with enemies having very specific ways to tackle them and not just blindly shoot them with arrows which don't work. To me it sounds like you guys only consider games with lots of character customizations and weapon/armor upgrades as having depth.
That's some depth but in a nut shell you end up killing things the same way.
Now the bigger enemies they are engaging to kill for sure. But more times that not you are killing humans and other things the same simple way over and over. You can mix it up just to do but it's pretty straight forward.
Think if horizon met monster Hunter or even breath of the wild.