My 2cents is better upscalers dont have this issue boss so time to invest in a better tv if this matters to you its pretty much that simple
Are you trolling or are you genuinely thinking this post has anything to do with upscaling? You know upscaling isn't something that magically make your content become 1080p, right? Plus, it's not an issue we are talking about, but a feature.
Ok since you obviously don't understand how integer scaling work, let me explain in a simple way, not sure you care, but some people might learn some stuff:
In order to have a very sharp image, with no blur or uneven scaling that cause strech pixels, we multiply the vertical source resolution (snes resolution 240p in that case) by an integer number (2x, 3x, 4x...) to come as close as possible to the native resolution of the screen. For the 720p of the switch, it's easy it's exactly 3 times, so you get it full screen in perfect resolution.
But if you want to use it in 1080p, the closest is 4 times, making it 960p, so it has black borders around the image, but still look good.
Now what is happening here is that 720p is stretched to 1080p fullscreen, so the ratio is 1.5, making it 4.5x of the snes native resolution, not 4 as it should be.
So no matter how good your TV/Upscaler your snes pixel will look more blurry and uneven than using an integer scale on a native 1080p.
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I am not on the libretro forums.
Best is just to join my Discord
https://discord.gg/wYPwZ9s and libretro Discord too
https://discord.gg/9HdWtZ3
We will add support for 1080p at some point, it just wasn't a prio pre-GL and now I am hung up with many other projects too
Thanks for the info