Because the game barely runs single player on Steam Deck, and they’d rather not handle a bunch of support tickets for people wondering why the game chugs when trying to make a low end system handle a lot more processing load.

The Steam Deck also means they can assume AMD hardware, so even if you don’t see the benefits, they might be there for someone else.

What you played on your Steam Deck before was a Windows build run through Proton. It’s not really luck that it ran before, but with a native build, you can start tweaking the way things work in Linux to optimize for what the Linux version is using. They must have seen the performance gains to be worth the time investment.

You have to dig a few layers deep, but it appears that they uploaded a Linux build that only downloads for Steam Decks, and they don’t seem to fully support non-Steam Deck. I haven’t verified a way to get around this, but often, where there’s a will, there’s a way. You might be able to force the game to download the Linux version from the Compatibility settings in Steam. At least at this point in time, Larian only seems interested in the Linux build for Steam Deck in particular, which I’ve never seen before.

I suppose I hardly noticed how long it took for DX12 to work because games had DX11 modes basically the entire time that Proton struggled with it. So again, not trying to sway you on anything, but optimistically, there’s going to be little to no games pushing any kind of envelope when a new technology like that comes along. It’s already prohibitively expensive for games to do so today, such that there are very few good games in a given year that make use of the latest tech.

There was a very clear dividing line between Wine before Proton and Wine after Proton. Maybe Indiana Jones and the Great Circle doesn’t work great on Proton on day 1, but it catches up so much more quickly than it used to, because there’s an incentive to. Anyway, I don’t mean to try to change your mind, and at least I get the perspective.

I guess, but it also simultaneously ports thousands of games that were never going to get updated with Linux builds even if Linux became 100% of the market tomorrow; several games I have now with native Linux ports are worse than the same game run through Proton. And when run through Proton, it’s no longer hitting Microsoft code. Anyway, this outcome in this post is the kind of thing that Valve expected to happen but has happened very little thus far, hopefully a sign of things to come.

I know native ports are important to some folks, and I know you’re one of them, but would you mind explaining why? Maybe you’ve done so in the past and I didn’t internalize it.

Larian’s own reasoning here appears to be squeezing it for more performance, and with Linux users now accounting for 6% of English-language players, I suspect more companies will find this to be worth the effort as that percentage rises and Windows becomes more of a pain in the ass.

EDIT: reworded statistic for accuracy

It’s hot enough off the presses that the Steam store page doesn’t even know about it yet, so it’s possible it propagates to GOG, too.

To be fair, what you tried to do is a pretty strange use case.