That is not correct, Windows is a DPI-aware since XP, which is much longer than Apple and its retina trend.
You can enable high pixel-ratios such as 1.25, 1.50... and any value of your choice in the "Appearance" settings, and even it is not convenient, this works without a big screen.
Now retina-screens trend is there, and hardware begin to rollout, more and more websites adapt to high picelRatios, and applications should do the same.
Windows offers tools to tell applications if the dpi setting is >1 or not, but ST just ignore it...
I don't have a MBP retina, but an ASUS UX32 Zenbook which offers a full-HD resolution into a 13" screen (165ppi), making the machine quite unusable without HiDPI setting. So whilst waiting for a bugfix (or new feature, call it what you want), I've created a HiDPI "forced" theme (derivated from Soda), which works quite well on HiDPI screens.
You can check this out on : github.com/Antwan86/soda-theme-hidpi (don't forget to set global font-size to a large enough value).