That simplified interface contains a new Start menu. Instead of live tiles, it offers a simplified list of your installed applications. It is a raster-based image with icons instead of tiles.
Windows 10X is still under development and has not yet been released. Microsoft clearly uses it as a test platform for a simplified desktop interface, and the new Start menu is part of that.
Let's face it: Microsoft makes a new Windows 10 interface for folding tablets. Live tiles are clearly more useful on a tablet than on a desktop PC. If Microsoft thinks that live tiles are not suitable for a modern tablet, why should it continue to use live tiles on the standard desktop version of Windows 10?
On 20 February 2020, Microsoft announced a set of new icons for Windows 10. The new icons exclude the flat, unicoloured aesthetic developed by Windows 8 and offer more color and complexity. This is how Christina Koehn from Microsoft explains how Microsoft wants to make its icons more consistent across platforms:
Flat, monochrome icons look great in context of colorful tiles, but as more icon styles enter the ecosystem, this approach must evolve.  The new icons in the latest development versions of Windows 10 do not really fit. Instead of using your system accent color, such as existing live tiles, these new tiles always use a blue background color. After all, they don't look good on some background colors.
These icons simply look much better on a Windows 10X-style icon grid than a set of Windows 8-style tiles.
Live tiles are already simply glorified shortcuts (mostly)
Live tiles were supposed to gain quick access to information without opening an application. They originally appeared on Windows Phone and added more information to the application shortcuts on your home screen.
In Windows 8, your home screen took up your entire screen. Live tiles are designed to transform that home screen from a simple startup program to a handy dashboard. You can view the weather, incoming emails, recent messages, news headlines, other status information directly on the tile of each application without opening the app.
Today, Windows 10 shows all the applications that you lock to your Start menu in a grid of tiles. . Most applications do not bother to display status information in their tiles. For most people, those tiles are just shortcuts that you click or tap to open an application.
See you soon, Live Tiles
The next update of Windows 10, also known as Windows 10 version 2004 or 20H1, is expected to be released sometime around May. 2020. That update is almost ready, so we do not expect to see any major changes in the Start menu there.
However, we would not be surprised if Microsoft sees live tiles for icons (with the 20H2 update) at the end of this year or in 2021. That gives Microsoft time to refine the new, icon-based interface in Windows 10X before this is rolled out to all Windows 10 PCs.
Windows Latest reports that "people familiar with the development" said: "Microsoft plans to replace live tiles with icons in a future update after the 20H2 release of Windows 10." Whether that specific rumor is true or not, the writing is on the wall. Most Windows 10 users do not use live tiles and Microsoft is clearly planning a future without them.
We already saw a leaked version of this Start menu appear in desktop builds of Windows 10 in July 2019. The leaked version is clearly an early work-in-progress, but it already fits much better on the Windows 10 desktop then the current Start menu.
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