It is not poor decision. They, like most developers, simply choose to make their game's images and animations with the best possible quality given their skills and hardware.
I disagree, I have discussed this here before. There are no practical reasons whatsoever to use lossless compressions AT ALL. The dip in quality you get from switching to better formats is practically ZERO, its imperceptible. Compared to the size savings which are IMMENSE. You would be doing not only yourself, but all the players a favor as well by not forcing them to download 6 GIGS!, when they can get the exact same experience in 500 or so megabytes.
That being said, if you do want to cater to the 4 people playing the game on 4k monitors, you can create the high res lossless version for them, but it should only be an after thought, and imo, not even worth it. From the conversations I've had here I have never heard a good reason from any dev, apart from just laziness, not bothering, or following convention. The worst was that "people don't download smaller games they think it doesn't have content" which is just,
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For me this is particularly jarring as this is standard in conventional game dev where you're texture budget is VERY limited, every megabyte counts, to the point where its the norm to have different maps packed into the same texture file in different channels. Granted VNs don't have such hard limits, but then the result of having no limits is in front of you. You get 6 gigs for a slideshow. I have seen all the way up to 15 gigs
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