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2019 isn't trailing edge. It's not like 1991. The 3072x1920 on a laptop sounds like a "retina screen".
The MacBook Air 2560x1600 also sounds like a "retina screen".
Those usually use the extra resolution to render fonts without sub-pixel addressing and often applications use 2 x 2 native pixels.
Without knowing the aspect ratio and size of the three screens one can't make any assumptions as to how good they are for A4 PDF or about the dpi. At least the iPad works well in Portrait and I doubt an iPad at 2560x1600 is "middling" compared to the price of other tablets. It would want to be about 13" to 14" diagonal for A4 single page actual size.
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