Since I was curious to see the differences, I took a short look at WT running both through Proton and native, and found some interesting results.
First of all the performance through Proton is almost doubled. I haven't finished yet, but for example the Tank Battle benchmark running at Maximum settings shows the native client at 75 FPS average, while through Proton jumps to 139 FPS. On the good side, the native client is extremely smooth, while through Proton still jumps now and then.

That being said, and curiously enough, the native client actually looks better at the same settings in several places. For one, looks like the actual shadow settings are running heavier on the native client. So I would have to make sure both clients are running at the exact same settings (despite what the control panel says) before settling to some definitive results.
In terms of features, what is missing from the native client are the highest AA settings, it goes only up to HQ FXAA, while DX goes to HQ TAA (TAA is stealing only about 10 FPS).
I also see with the DX client some extra patches of grass/vegetation (not sure what they are) in some cases, they are visible in the screenshots below.
Other than that, I haven't found so far any differences between the two clients in terms of image quality.
I haven't though entered in a proper battle (due to EAC) and only checked the benchmark and went to some test driving.

Here is a comparison between the two (Native on the left, Proton on the right), where you can see the shadows partially missing from the DX client.
https://cdn.knightlab.com/libs/juxtapose/latest/embed/index.html?uid=b095cc2e-d6a7-11e9-b9b8-0edaf8f81e27 [External Link]

If the above link doesn't work, maybe this one will:
http://www.framecompare.com/image-compare/screenshotcomparison/D7YPGNNX#tab_1 [External Link]

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Last time I checked WT native vs DX (not Proton) there were indeed differences when looking side by side, I remember higher quality vegetation in the DX version for example, and I think AA was lower quality for native.
That being said, the differences were not something striking. That was about the time they removed the DX9 support I believe, when there was an engine rework or something (likely last year).
Not sure if in the meantime the DX version was improved so drastically so that it would justify calling the native version as horrid. Or was the native version downgraded in image quality?
As for diff in performance, not sure how good runs in DX, but like I said, the native version runs already very well even at max settings.
I imagine though that someone needing 4K or higher refresh etc could benefit from running through Proton, if the difference in perf is so huge as stated, but again, the current state of the native version is far from being horrid.

Nevertheless, I'm even more curious now to see an actual comparison, both in quality and performance.

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I keep hearing about how bad native version runs, but I don't see it. It works and looks just fine for me, actually more than fine, quite good.
Probably looks better (?) with SteamPlay, but horrid, really?

horrid
/ˈhɒrɪd/
adjective
1.
causing horror.
"a horrid nightmare"
synonyms: horrifying, horrible, horrific, horrendous, dreadful, frightful, fearful, awful, terrible, shocking, appalling, hideous, grim, grisly, ghastly, harrowing, gruesome, heinous, vile, nightmarish, macabre, unspeakable, hair-raising, spine-chilling; loathsome, monstrous, abhorrent, detestable, hateful, execrable, abominable, atrocious, sickening, nauseating
"horrid apparitions"

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Then I'm glad that I bought it a while back.

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Not interested on playing Wow, but I like how this site is always on top of things.

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I've seen some other developers (with windows-only released games) keeping an eye on Wine/Proton too.
For example The Cursed Forest demo had at one point this splash mentioning Proton:



https://store.steampowered.com/app/345430/The_Cursed_Forest/ [External Link]

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I just hope they'll keep and fix the Vulkan renderer, that'll be good for Proton.

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Does RPCS3 have save-states?
(last time I checked several issues prevented that, the save-states were too big in size, a lot of code needed to be changed for this to work, etc)

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A Linux version with separated server/s will wither an die IMO. No point in maintaining it I believe.

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About the Linux'port of SOTTR, there was an update few days ago on their "domesticated" branches. Not sure what that means, just saying.

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