Don't worship Windows 8/8.1.
It also introduced WinRT, an API that gave the programmers a lot less freedom; the roadmap was clear: applications should from now on be developed for the WinRT API, and only be distributed via an app store (Windows Store). The old WinAPI shall be legacy, and will only be provided as long as Microsoft is willing to.
Windows 8's ARM version (Windows RT) was incredibly locked-down; here applications could only be installed via an app store (Windows Store). It was clear that Microsoft had similar plans for the x86 version.
Actually, because of programmers' and users outcry regarding this, Microsoft pedaled back in this regard with Windows 10 (but started introducing a lot more telemetry).
Also, Windows 8 was the Windows version that started the tight integration of the local user account and the Microsoft account. Windows 8 and 8.1 were the first versions of Windows for which the "How can I avoid setting up a Microsoft account when installing Windows?" tutorials started.
No, Win8 was all about the Metro/RT nonsense, the attempt to convert Windows into a touch-centric locked-down App Store platform.
While a fair bit of that lived on in 10, it was far less obnoxious. Although they still managed to break things like Sticky Notes in the process of converting them to 'store apps'