How many times have you uttered the words, “double click any tab and the ribbon will come back?” Or, “the tab is the thing at the top of your screen that says HOME on it... It’s gray...?”
Microsoft has the toolbar hidden in Windows 10 folders until you stumble across that slate grey arrow in the upper right by the ? mark. They have the same feature in Outlook. At least there it is not hiding the toolbar initially.
They also hide This PC, Control Panel, User Files, Recycle Bin until you stumble across it in Start button> Settings> Personalization> Themes> Desktop icon settings.
I am glad they do not do interior car design and hide the steering wheel or light switches that ask “are you sure you want the light on?”
Hiding the tools to navigate around is stupid.