You may not have noticed, but the behaviour of Shut Down and Restart have been changed for the Fall Creators Update. If you shut down or restart while apps are still open, those that are capable of being restarted will reopen on the next boot. It's one of the least publicised new features and has caused much head-scratching until we got to the bottom of it.
on a restart Fall Creators Update reopens apps from before
Apparently this is 'for our own good'...
https://twitter.com/JenMsft/status/921002512739532801
I too see the extra screens now, but for me they don't last too long. Presumably they are shown while the data necessary for restarting the apps is being saved/reloaded. Not all apps can be restarted, Notepad and Edge can't, Wordpad and IE can.
There are two way to shut down the 'old' way without restarting apps.
Alt-F4 on the desktop still shuts down the old way. Shortcuts using
the shutdown command can also be used. My preferred method is the shortcuts, putting them in a folder means I can have a toolbar on my taskbar for quick access. I use shutdown /p to shut down, it should shut down using Fast Startup if you have it turned on (I prefer it turned off).
Shut Down Computer in Windows 10
Edit: Comparing the old and new styles of shut down, I still see the 'please wait...' screen on boot after an 'old style' shut down, but its there for a much shorter time. It seems to replace what was just a black screen with just a mouse cursor that I saw in previous versions. I always wondered if it was ever going to start when I saw that, perhaps the circling dots are there to reassure us that it's still working :)