Re: is windows 10 optimized for small 8" display tablets?
So many things, It has been discussed many times. For example, It's great that they removed the Charms Bar and App Bar.
Why is that great for tablet users? Is it somehow easier to wade through endless menus, clicking and searching, than it was to swipe in from the right of the screen and have the things you wanted right there under your finger?
Commands like Share and Search should be in the app surface whenever it make sense.
And they are in every app where it makes sense. e.g. Store, music, contacts (people),etc., etc., etc.
App's commands shouldn't be effectively hidden and only accessible through gestures.
And nothing is. Not. One. Thing. OTOH, I can think of several desktop things I do every day that are only accessible via hotkeys. e.g. ALT+TAB.
Commands that are frequently used should be positioned close at hand, those that aren't frequently used are nicely organized in the hamburger menu in Windows 10.
Fine in theory but that's simply not how it is being done in W10. e.g. Try and change the font or colours in the Kindle app and tell me how long it takes you. I agree that putting app settings into the Charms bar was a stupid idea but no-one was ever forced to do it. e.g. Have a look at the VLC app, its settings are accessed from a downward arrow button in the top-right corner. Even so, whatever they have done in W10 hasn't fixed it. In fact, if anything it has made it even worse. (See my Kindle example.)
Horizontal scrolling was a really bad idea. Tablets are used most of the time in portrait orientation.
So what you are saying is that horizontal scrolling is a bad choice for portrait oriented screens? If that's true, and I agree completely, then it stands to reason that horizontal scrolling is a good choice for landscape oriented screens, like those on every laptop and desktop computer in the universe. So why would you think horizontal scrolling was a tablet feature? I always figured it was designed very much to make best use of space on desktop monitors. That said, I doubt I use my tablet in portrait mode for even 10% of the time I spend using it, so maybe that was designed to make things better for everyone. Never mind, it's gone now and we can all spend the rest of our days looking at vast empty areas of nothing on either side of every web page.
Windows 8 apps don't use the space efficiently, there is too much white space.
How does Windows 10 fix this? From what I've seen, new UWP apps are very similar. In any event, these are simply choices made by developers, not restrictions placed upon them by W8.
Windows 10 apps have more information density which is important for smaller tablets.
Apart from being completely wrong (see above), this simply makes no sense. What sort of ***** would want to see more information on an 8" screen than on a 27" screen? Why do you think the mobile version of every website on the internet is far less info-dense than the normal version?
Windows 8 is bad in all the form factors. In hybrid devices It's even worse because the desktop and modern environments are like water and oil. Continuum solves that.
I must now assume you have never so much as tried Windows 8 in a shop because every word of each of those sentences is completely wrong. I spend 6 or more hours every day in front of Windows 8 and what I really like about it is just how seamless and consistent the experience is. In fact, if anything, I wish the desktop was much more like the Modern UI but instead it is almost exactly the same as W7. And let's not forget that Continuum doesn't even exist yet, it is a feature that no-one has seen, it has not been in any build and will not be included in the initial release of Windows 10. It is the very definition of vapourware at this point in time. OTOH, al the things they are promising it will do are things Windows 8 already does. It is just a marketing term for a collection of features everyone takes for granted in W8.
So if that's all you have, then my advice is to give it up. You clearly have no idea what you are talking about and, therefore, nothing of value to contribute here.