This is a very good post and reminder.
I too have read about the potential upgrade path ONLY from Windows 8.1, and no reference to Windows 8. Through no error on our part, and perhaps because of UEFI bios issues, or whatever, we are stuck i n an unenviable position and hampered by MS inability to help its customers.
I have just bought 2 Apple units for school for my kids, as THEY preferenced these over MS products. That is shouting loudly about the future of MS computing and today's generations.
Take note MS, I still like your system, but am now forced to learn Apple software to help my kids. Perhaps I am a fossil to your product and you need to take note.
Steve H