I could have elaborated more, but I didn't want to distract from the main topic which is windows 7. However...
However, you've reminded me of three problematic things with the last three, but luckily the third and fifth options are easily fixable (the split screen thing is pathetic, I agree, but the information density thing was solved I think in Windows Phone 8.1). I think the fourth one would be harder to fix since that's just the way the OS works, but I'm not to sure. Still....these shouldn't be things that need to be fixed considering it's been a standard thing for decades.
I don't know what you are possibly talking about as NONE of those things have been standard in any way for the windows OS. The only apps that only run full screen are things like games, but for normal apps no way is that acceptable. And I have -never- used or even heard of another desktop OS that doesn't let the user control what apps are running and which get closed. Taking that kind of control away is insane. And the information density thing... again this has never been an issue with any prior versions of windows. So while win 8 may be fine for a touch device, for desktop use it is a big step backwards. And thus a horrible mistake on MS's part to try to force desktop users into it.
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Now, to direct the conversation beck to Win 7 (which doesn't have any of those problems by the way), there are a couple things about it that tend to annoy me. Though they are admittedly minor.
-I don't like windows snapping to the screen edges.
I commonly move windows partially off screen to move them out of the way, and this feature ends up just making those windows get in my way worse. Thankfully, you can turn this feature off.
-I also don't like the shake window to close all other windows. However, I've only ran into this a couple times by accedent. Most the time it's a non issue.