I've used Alt-F4 to shut down not only apps, but Win7. Doing this on Win10 brings up the same dialog as Win7, which always offered the option of just "Shut Down" with another option having the "Install Windows Updates" ability.
My computer doesn't have Updates to do ATM, so I can't confirm if it still has the "Shut Down" option separately.
Edit:
With Windows 10 how can I shut down without installing updates?
That thread has some options, although they don't include an official MS solution. I can't find anything, in my short search, that says Microsoft has an official solution for this situation. It mes me think they either haven't considered this situation, considered it too low a probability event to bother with, or they just don't care.
shutdown /r /t 0
trick does not work on Win 10. I’ve decided to live with it.