There isn't any "letting it run" here, there is does Microsoft want to backport this feature to Windows 10? There are challenges with that as the hardware support is much more varied for Windows 10 than 11 and so there are impacts to consider ranging from the weaker hardware requirements for 10 to how these things are integrated in with the OS.
Source: I worked at MS, on the OS codebase in security.
Kinect / XBOX is much simpler than this as the hardware was at least known and standardized.
Also I get the feeling that everyone that cares about their long term career at Microsoft are now on Azure, as the future Cloud OS from Microsoft, so we end up with these gimmicks trying to sell needless upgrades.
Yet what they could do better than anything else would be to move away from COM / C++ mindset at WinDev, but alas, that is asking too much.
At that point Windows 10 will be EOL, so Microsoft would have a legitimate excuse to give no subsequent fucks. Anyone who needs or cares about manufacturer support will downgrade at that point.
As for the never-downgrade diehards, well, they were never going to downgrade anyway (source: me, Windows 7 machine as daily driver for non-gaming tasks).