I currently have a desktop running Fedora and a laptop running Windows 7. I've had various microcontroller development that was better supported on Windows; several emulators where the version with the debugging tools is Windows-only; I've crossed paths with Visual Studio a few times; and I have a Windows-only USB oscilloscope that I bought before I knew to care about that (so sometimes I end up doing e.g. Arduino development on Windows just for physical space convenience).
All the time, I run into things that would have just worked on Fedora and give some degree of headache on Windows. I've used Unixkit / MSYS / Git for Windows tools / Cygwin / VMs at various points in time. A VM isn't well-integrated with the Windows system, and the bash terminal in the others just isn't nearly as nice as a real one. All of these options have things that don't work or will trip me up in some way, e.g. the version of GNU cp in the former 3 was really old and didn't have some option I needed. This new thing really sounds like it might be better. But maybe I hope for too much
Looks like I can upgrade until July if I decide it's a good idea. Better now than being an early adopter anyway.
I've been hearing that Microsoft already backported most of the Windows 10 spyware to Windows 7, and I've probably installed it all without paying much attention...