Is “Steam Deck” a preset in the graphic settings selector? If so it is pretty cool, I’ve seen many games claim “optimized for settings “ but unless there is a preset is up to the user to fiddle until it get the optimal settings. This is a cool idea, haven’t seen it before.
Some other games have this too, I know Cyberpunk and the Witcher 3 both come with a Steam Deck preset. I think I heard the First Descendent and Horizon Zero Dawn do too, but I'm not sure.
My experience with Cyberpunk was that the Steam Deck preset was a good starting point, but wasn't actually an ideal way to play the game. Hopefully the Helldivers one will be better tuned.
They should do it like on consoles, reduce the graphics to guarantee stable FPS on resource intensive moments (like combat).
Although, on PS5 they apply a lot of variable rate shading mixed with upscaling/FSR. VRS is something I don't really like but it the drop is minimal it's ok.