First, I must state that it is not that "ejecting" the drive always prompt the "This drive is still utilized by etc." message.
It is that there is simply no option to "eject" it in the first place in my Windows 10 Pro x64 release (no preview).
This website shows what I mean (even if it was for the preview version of W10).
My USB-powered disks are configured with the "Quick removal policy", so in theory I could unplug the USB drive at any time, but...
I just wanted to know if this was the new normal behaviour in Windows 10 to not allow to eject if in quick removal mode, or if this is a bug with Windows!