I think wallpapers are a way to be connected with Patreons, like some type of reward while people wait for the chapter, like a way to give something while people wait, i don´t know if i´m explaining myself good because i´m sleepy.
But yeah, i´m with you, when devs make wallpapers i just see them i react to them with a emoji which defines how i feel, if i like, gets me horny or that stuff and i just leave them, i don´t use them for nothing.
But for some people could be important, i don´t know, like a way to stay in contact with the game or things like that, just imagine if Ocean doesn´t give people this wallpapers, sooo many months with just dev logs, some people will go crazy
, but yes yes, i don´t use them so i don´t really care if there are or not, but it´s true that takes time to make them.
Edit: Those last wallpapers reminds me to girl from
Eternum: Idriel (?)