I swear if the boxed release is yet an other steam key in a box (WHY), I'm not buying this at all.
We need to beat some sense in these publishers.

Those are JAPANESE publishers. It's a miracle that even the base game alone, will come DRM-Free.

Japan is the last place I found a boxed DRM free game I could buy though (which I did). If there is a miracle, it's that it's multi-lingual on release. Otherwise it's pretty natural for a japanese game to be DRM free, outside of consoles they're not the most literate in PC games (as proven yet again by the lack of keybinding in this game).

I know the kickstarter had collector tiers where you get sent a box, but I'm afraid it will not contain an actual copy of the game for the PC version.
So I have two concerns : no boxed release, or a box with a steam key.
I don't get it, GOG provides perfect offline installers, yet no one issues them for their retail releases (I'm mad forever against warhorse studios). Publishers are bonkers. Are there really steam drones getting their keys through retail?

Well, 2 games I know got DRM-Free Boxed releases were Mighty Nº 9 and Yooka-Laylee, only because they were on kickstarter.

I'm afraid this situation won't change anytime soon cause people still keep supporting lots of bad business practices. Or they do nothing to resolve this issue.

Also Japanese publishers and developers are really paranoid about PC games piracy because of what happened there during the microcomputer and Famicom disk system era, getting games on GOG at all is already quite a big step from them.