Pretty much what the title says.

A bit of context, I was digging some game to test a laptop with dual graphics (yeah, one of those freaking aberrations) under Linux and was quite in awe to haven't found a single graphic intensive Linux native on GOG.

Shadow Tactics and many other similar Unity games, Divinity OS and Northgard seem to be some of the most intensive but they are not that much intensive.
I had a look at Stellaris and some 4K Warhammer games but they seem to not being that graphic intensive as well. They maybe hard to run on later gameplay though.

Am I missing something as usual or pretty much all of the modern games with a Linux version didn't land on GOG?

Found one X4 Foundations wich runs on Vulkan.

Quern Undying Thoughts uses a fair bit of GPU especially at higher resolutions. Unfortunately quite a few games here are missing Linux builds here (outdated list) that other platforms have including Bioshock Infinite, Deus Ex: Mankind Divided, Q.U.B.E.: Director's Cut, Saints Row IV, The Talos Principle, etc. And speaking of Shadow Tactics: Blades of the Shogun, the base game here has a Linux build but Aiko's Choice DLC is missing it too.

Stellaris at later stages is CPU intensive rather than GPU.

I heard Pillars of Eternity 2 can be quite demanding with big fights and spell effects going on (but not sure how much for GPU).

Maybe Sudden Strike 4

Or Hellpoint

There is also Witcher 2 but it's technically Wine wrapper, not native.

EVERSPACE 2 is rather graphically intensive - however it doesn't yet have a Linux version (which will be available on release). Since it's built using the Unreal Engine 4, it will use its Vulkan renderer. The Witcher 2 is only "intensive" because it's not multi-core optimized, otherwise it's hardly cutting edge any more. And it uses eON not Wine.

Everspace 2 looks absolutely gorgeous. I would prefer a bit less color saturation and vibrance but we are in 2022, so... Pillars of Eternety 2 and Sudden Strike 4 don't appear to be that much intensive, graphic wise.
Hellpoint on the other hand, with all those lights reflections might need considerable horpower, specially as a action game. Quern kinda reminds me the Talos Principle. Interesting texture style, most seem to have some noise.

I was aware some Linux versions were not released on GOG but not to the extent that most high profile games don't.

Most of these ports were made by Feral Interactive which is known for being against DRM-free. And that's one of the very few companies interested in porting AA-AAA games to linux.

Are you saying they will port games to Linux? But are against DRM free games? That does not make since to me.

Don't know if they anti or pro DRM but none of their ports land on GOG despite being available on Steam, icluding both XComs, Tomb Raider and Mad Max.
As I understan Feral makes the Linux ports but also publishes the said version, so it maybe some other issue than being pro-DRM.

Interesting enough, just found Feral delisted a couple of games from their catalog, icluding Mad Max and Tomb Raider reboot. The stated "licence expiring" maybe the reason why such versions are not available on GOG.