TSR and FSR2+ are decent enough in some cases. FF7 Rebirth's upscaler manages to be a lot worse than your average old FSR lol. But I personally very much enjoyed PS5 Rebirth 60fps on a 1080p display, and the image quality didn't bother me for some reason. Guess I'm just growing less sensitive to lower resolutions.

Nah, TSR and FSR2+ is Terrible.

FSR4 is where it gets "good enough". But I still can't standle the fizzle and pixel crawl and other artifacts, so I rather just run with a raw native resolution image on PC, just means I may have to scale some visual settings back or sit at only 60fps.

I don't have the game to test it myself, but Digital Foundry concluded that TSR is superior to DLSS in Tekken 8's case for example.

It's all relative, and some are more sensitive to this stuff than others. I primarily game on an old 1080p display, I just don't care that much about higher image quality, upscalers, and whatnot. Might upgrade to OLED 4K when I get a PS6 or upgrade my PC.

Correct, and DQ11 isn't so much of a port as it is a remake and came out 2 years later. It utilizes different assets and a newer version of UE4 than the original. It becomes especially noticeable when S came to other systems and the polygon count was worse compared to the vanilla release, so they could not just add S content to vanilla as DLC. 

It being a request from Iwata doesn't change the fact that they pulled it off though, I doubt the reworking was so extensive just because of his death.

It's not the only such conversion on Switch; games like Sniper Elite 4, Zombie Army 4, Strange Brigade, Ace Combat 7, Nier Automata, and Alien Isolation also managed to look remarkably close to the full fat console versions in spite of the power gap through careful and clever tweaking.

It's not just "sensitivity" to this stuff... There is actually some legitimate reasons why it's a bigger issue for some, over others.

Firstly... The display you are running plays one of the biggest roles... If you are using a garbage 1080P, Twisted Nematic Panel of around 19"-27" then you are probably not going to perceive these issues to the same extent compared to someone who is running a 4k, OLED of the 40" caliber.

Then you have the distance you sit from the display... A 27" 1080P panel can have the same "perceived" sharpness of a 4k, 40" panel depending on distance you sit from the display. I.E. Perceived Pixels Per Inch.

Then throw in the game itself... Games that use hyper-stylized visuals tend to get away with artifacts more than say... Hyper realistic games.

I'm aware. My room's TV which is connected to my PC and a PS5 is a 32" LCD from 2010~. I have another 55" 4K display connected to a Switch in the living room, occasionally I'd use/test the PS5 on it. Going back and forth between the systems and displays I got, including my smartphone's OLED screen (Google Pixel now, Galaxy before it) doesn't show huge differences to me. I can barely perceive them without side by side comparisons.

I'm more sensitive to color accuracy. What I usually do is calibrate my displays to look similar to my smartphones. Once that is done, my 1080p TV and phone display are virtually identical for video viewing. I mainly perceive the black levels difference at night with lights off. Picture quality difference is superficial otherwise.

In gaming... the combination of native resolution, anti aliasing, and final output will obviously make a more noticeable difference, but it's not a big deal to me. For instance when I switch from Rebirth's quality to performance mode, the difference is immediately noticeable (the vaseline filter), but I forget about it in seconds. And Rebirth's performance mode is supposed to be the worst case scenario, a nightmare among nightmares! UNPLAYABLE!!! (worse overall than the typical FSR2 and TSR implementations).

But yeah, my PC being underpowered and the PS5 struggling to reach native 4K at 60fps are the main reasons I don't see upgrading to OLED 4K worth it yet. Low resolutions content like 1080p look better on a 1080p display than on a 4K display.

I think there is a fundemental difference between those ports and the work behind DQXIS. @Leynos explained it very well.

Optimizing is one thing. Working from the ground up and creating new content is a very different story. DQXIS was a special case and easily the biggest effort we have ever seen in bringing an 8th gen game to the Switch. By quite a margin. 

This doesn't mean Rebirth can't get a competent version on Switch 2 that is well optimized. I just say that I don't think SE would do the kind of effort we saw on DQXIS just for the fun of it

DQ11 on Switch is extensively reworked, but I wouldn't agree it's a remake. Most of the changes are still the usual techniques like simplifying polygon meshes, lowering texture and shadow resolution, disabling screen space reflections, reigning in draw distance and grass density, etc.

It definitely got a lot more care and effort put into it than most ports, but it is still just that, a port.

As far as how extensively they'll tweak Rebirth, I guess we'll just have to wait and see. Hopefully they put in the effort to deliver a quality conversion.

It has new content, new story beats, an orchestrated soundtrack, the whole 2D mode with exclusive missions, gameplay tweeks and quality of life stuff.

It may not be strictly a remake, but it's definitely far beyond what any third party port has done on the Switch.