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How long ago did 300dpi printing become obsolete? These days I usually print drafts at 600dpi, because laser printers and LANs are fast enough that it's not annoying, and I don't usually explicitly notice jaggies at 300dpi, but you can still tell that the higher resolution looks better, if you care.
But that's black and white text printed on dead trees, not screens. Sure, it's harder to notice minor resolution differences with color photographs than with letters that have well-defined edges, and even harder to tell with moving images, but if you're using anti-aliased text on your screen, because it just looks better than non-anti-aliased, that's because you need more pixels. And yes, you've got enough GPU horsepower these days to trade the processing needed for anti-aliasing against the higher screen resolution, but you're doing it because your screen resolution isn't high enough.
I'm using a 17" 1920x1080 screen, and I'd like more pixels. This is generally good enough, with anti-aliased fonts, and the 22" 1080p screen at my office looks surprisingly good, but I'd still prefer 2560 instead of 1920, and the big advantage of 4K would be to have two readable pages side-by-side, which means more pixels vertically. (Sure, 16:9's fine for watching movies, but that's very seldom what I'm using that screen real estate for.)
You're still alive, old man?!
Well if it means we're going from small devices with small apps and small amounts of resources to suddenly making them full on desktop machines, I just don't see the point.
And that's totally fine. The point isn't what YOU want, it's what some private company wants to do and these actions will in no way, shape, or form negatively impact your life and thus getting all up in a huff about it is a little over the top.
What percentage of Android owners even remotely want any of this?
Users don't know what they want until it is provided to them and, honestly, if you don't want any part of it, that's cool but perhaps it will really help developers port their work cross-platform and bring us to a completely different level.
I would love to see Android or iOS apps come back across the divide in some cases, so there's likely a market in reverse.
No sense in getting all fired up about CodeWeavers doing this.
A bug in the hand is better than one as yet undetected.