Once you update, Windows 10 is gonna reboot sooner or later. You can schedule it, but there's nothing you can do to stop it. It's unavoidable. It doesn't care if you're running a long compile, or uploading a large file. If you aren't sitting in front of the computer, it's gonna reboot, period.
I find this to be unacceptable.
The previous behavior, where it essentially nagged you mercilessly until you acquiesced, was far superior. I didn't go out of my way to find a 3rd party program to disable that nag-- I found it useful, to remind me I had to reboot at some point, when I found it convenient to do so.