Seems to be copying Windows 8 and 10. I keep a Windows Metro Twitter app open on my desktop PC in the corner of one screen. Far neater than keeping a tab of Firefox or Chrome open for just Twitter.
Being able to run the exact same apps on PC, tablet and phone, and all desktop software on both PC and tablet, is a great thing about Windows.
It's where, IMHO, Apple screwed up with the iPad Pro having a basic tablet OS rather than the full OS of Windows tablets, and it's where Apple is restricting its users options and capabilities for the sake of keeping control over the walled garden app store and its income. iPads run apps only. Macbooks run Mac programs only.
I'm sure Microsoft aren't thrilled about this. With so many more apps than the Windows app store having the Google Play Store now on laptops is tempting. But Windows tablets can run full desktop software, which is a huge advantage.
It will be interesting to hear how people will view Chromebooks compared to Windows 10. Chromebooks boast about "automatically updated", a part of Windows 10 many people hate, and Google's whole business model is spying on you to sell you stuff, again something some people hold against Windows 10.