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NT claims better flexibility, however it is Linux, which can be used from Cloud to Cluster to Desktop to Mobile to Small-embedded devices

NT is deployed in all these cases too.

Putting it in embedded devices only became possible about two years ago, no?

No; NT Embedded existed based on NT 4, in the late 1990s.

Those versions did not run on embedded devices (in the common usage), but rather PCs that needed reduced functionality, such as ATMs.