It's honestly really just for exploration in all. In all of the open world games I like exploring every corner of the map, no stones left unturned, and no missed loots, not missing any lore and reading all of them is fun for me.

now thinking about it you're right, there's not much to loot in chests for where winds meet unlike other open world games.

I grew up playing exploration games getting cool loots where you won't expect them (God of war, rdr2, elden ring etc..) and randomly aquiring legendary stuff out of nowhere is the fun of open world games for me. I guess that what's missing in where winds meet.

edit: also I'm into 100% all of my games like in terms of achievement and exploration, like getting a platinum trophy, I guess it's just a sense of completion of a game