Thanks but I definitely don't want to reset my phone(!) That is, I don't want to, quote: "... return it to the same state it was in the first time you turned it on. All your personal content will be erased, and the phone will be restored to its factory settings." Yikes.
I just want to reboot it easier.
Simply, instead of a dialog that only says "swipe down to shutdown", offer one that gives the additional option of restarting.
Is this so complicated? It's Windows 10. Windows has had this option in their PC products since the beginning. Why not with Windows Phone 10?
Yes...No someone already gave you an answer, holding just the power button for 10 seconds restarts the phone it doesn't reset it back to factory settings. From reading why you want to do it and what you think is happening you really don't understand what the phone does, just from reading what your trying to do.
Pressing the power button doesn't shutdown the device, it just locks the phone, you hit it again and it will unlock.
Holding it to swipe down to shutdown does just like a PC and turns the device off. When the lights turn off on the device just simply click the power button for a second will boot it back on. You can't do anything during these process to damage the device in anyway.
Holding the power button for 10 seconds will reset the device automatically but I only reccomend this process if your phone becomes stuck/frozen.
Holding the Power+Volume down does the same step as above.
While the phone is turning back on, if you hold the volume rocker up or down it will bring up options to reset the device to factory image or other ways of doing things. While its turning on don't press/hold them if you don't want to reset the device to factory image.
If you hit the power button while the device shuts down, your doing nothing more then just locking the screen, the phone will continue to shutdown and turn off, this doesn't hurt anything.
Hope that helps explain something's better for you.