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The best reason I can think of is portability. Visiting your parents and using their computer? No need to install a native app, just open the web page (hopefully in the future at least, this says you still need to install a plug-in). Want to use it on Linux? No need to wait for Microsoft to update the Linux app (if they ever bother to update it), just use a standard-compatible browser to open the web page. Microsoft wants to add features? No need to make sure it works on a bunch of different OSes and versions, just make sure the web page is still compliant with the standards (you still need to make sure the browsers handle the standards correctly, but this should be an easier target).
Not that this is perfect by any means. But nowadays computers perform well enough that most users won't even notice the problems you mention, and the other advantages more than make up for the problems.
That means you can't have any sleep-monitoring functionality in the watch, and health tracking is the only thing that will get many of us to strap something to our wrists, since watches have been made obsolete by our phones. A 24 hour charge, with a very fast charger or easily replaceable battery is the only way to make this work. Charging one battery while you're using the other, and making a quick swap is probably the best solution with current technology.
I suspect the number of people wanting to strap a device to their wrists for sleep monitoring are a very small subset of the potential smartwatch market. The changes you suggest would hurt the already struggling battery life of this thing, and make it bigger to boot. Given the small number of people that would take advantage of those things for sleep monitoring and the number of sales that would be lost due to the battery and size changes, it wouldn't be worth it.
The slight curvature also reduces visual geometric distortion. When you watch a perfectly flat TV screen, Soneira explained, the corners of the screen are farther away than the center so they appear smaller.
I have a 30" computer monitor at work, and while I like it better than my old dual-screen setup, I've noticed this issue with windows placed close to the edges. I wonder if there are curved computer monitors in the works, or if this is just for huge TVs. The main problem mentioned with curved TVs (distorted view for anyone off-center) would rarely be a problem with a screen that usually only has one viewer, and it would fix the edge distortion problem.
Mozilla would have preferred to see the content industry move away from locking content to a specific device (so called node-locking), and worked to provide alternatives.
Instead, this approach has now been enshrined in the W3C EME specification. With Google and Microsoft shipping W3C EME and content providers moving over their content from plugins to W3C EME Firefox users are at risk of not being able to access DRM restricted content (e.g. Netflix, Amazon Video, Hulu), which can make up more than 30% of the downstream traffic in North America.
Translation: We don't like this, but if we boycott it we are going to lose users to browsers run by companies more concerned about keeping media companies happy so they can keep licensing content.