* The APIs are there now, but the hardware isn't on many machines.
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* Yes, I'm referring to graphics tablets. I've had to deal with the APIs for that stuff myself and what was about 10 lines of extra event handlers on OSX ended up being well over 200 lines on Windows.
* There's still driver issues that aren't present on OSX.
* You've got to realise that anywhere where you think "this really isn't that big a deal" it's actually a huge deal to the people who use OSX daily and want a better Mac Pro because Windows doesn't care about the small things.
* Cortana isn't better than Siri though, which is what it's actually meant to compete with.
* To be fair, the feature was so undiscoverable that it took someone on Hacker News telling me about it before I knew it existed.
A lot of my post was pointing out things that have been better on OSX for literally more than a decade before Windows finally caught up in a few areas.
HiDPI is probably the biggest thing that Windows just won't catch up to for a while. The API compatibility requires Windows to support APIs that will stop HiDPI from working well, because old Windows had the ability to set DPI that affected certain UI components but not everything.