Indeed. If you have hybrid sleep you aren't really shutting down. You are storing some state of the OS so it can resume quicker (and so not all locks on objects are released and they can't be replaced).
If you restart then you do actually fully shutdown. This means the locks on objects are released and they can be replaced by the new ones that came with your update. It was the same in 8 iirc (I wouldn't swear to it though, I can't really remember)
I have Fast Startup turned on, I'll change it and see what it does on the next update.
I just took shutdown (not restart) option on a PC with powercfg -h off set and some cumulative update to apply.
It has the "Working on updates, do not turn off your computer" message so I guess that is indeed the reason.
powercfg -h off is one of the first things I do on a clean install. It nukes the hyberfil.sys file and turns of sleep/hibernation. I never use sleep or hibernation anyway. I have an SSD in my laptop and desktop so Fast Startup isn't needed either.
Forgot to mention, I put a shortcut on my taskbar and Start Screen that does a shutdown.exe /s /t 00. Then its just the 1 click it when I want to shut down my PC.
The introduction to this explains it better than I can Fast Startup - Turn On or Off in Windows 8
I can't really imagine why you would want to use it as in my experience it is slower but I guess if you close your laptop without saving your Word document (and then leave it closed until the battery runs out in sleep mode) it might be handy.
If you have a laptop with a slow 5400 RPM spinner drive, it likely speeds up the boot up/log on process. It likely slows down the shutdown process though as it saves everything to the hyperfil.sys file. If you have an SSD I don't see the point though. It doesn't offer any noticeable speed up in log on for me. The other down side to it is, in a lot of cases it makes BIOS access problematic. You can't access it on boot up or get access to the Quick Boot Menu on boot up to boot from external media. You have to dig through a menu to reboot into your UEFI settings. That is one of the big reasons I turn it off. Also in the past I have also found Sleep and Hibernate to be unreliable. My PC goes to sleep but will not wake up. It was more trouble than it was worth.
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The power button on the Start Screen list Shut Down and Restart as options.
