@FightPig
说的是这个 world.hey.com/dhh/fonts-don-t-have-to-look-awful-on-windows-564c9d2f Fonts don't have to look awful on Windows 还有这个 twitter.com/dhh/status/1762595923857903860 DHH on X: "That crazy 8K Dell monitor came in, and the text is so fucking crisp, it's hard to convey in words. Substantial step up over the 6K Pro Display. But... there's a caveat. It basically doesn't work in dark mode. The thing is a mirror. Is this good enough to give up on dark mode? " / X ？

他的意思应该是 Retina 级别就可以了，他是先用的 Pro Display XDR ，然后觉得很不错，换了 8k 之后更好了由奢入俭难了。这个和楼主的看法是相反的，DHH 认为硬件到了一个 baseline 之后下两边是没啥差距的。对于桌面系统这个 baseline 就是苹果惯用的 218 dpi 左右（即 27 寸 5K ，32 寸 6K ），不难发现现在 PC 主流的 HiDPI 硬件比这个低了至少一个等级，但是还没到 8k 那么夸张。

不过这个说法也就仅供参考，毕竟他还说：
> I just spent last week using a PC on a 27" 4K monitor (163 PPI) where I accidentally committed the other common cardinal sin that make fonts look like shit on any system: Fractional scaling. I had the screen set to 150%. No wonder it looked offensively bad compared to the Mac! You can't split a pixel, so the system has to do all sorts of typographically nasty tricks when doing non-integer scaling, and the end result is awful font rendering.

我是看不出 fractional scaling 和字体渲染之间有啥必然联系，正确实现的 fractional scaling 不需要在字体渲染级别 split a pixel 。结合他给出的引用，他很有可能搞混了 fractional scaling 和 subpixel rendering 。