Is there a way to restart an iPhone or iPad instead of just "power off"? That's because currently, you have to press Home button and see the turning wheel for the shut down, and then wait, and then start the iPhone or iPad again.  Is there an obvious or hidden secret method to just restart (or reboot) it?

P.S. the current Android 7.0 actually has this option, and is handy if I can just choose it and not look at it or walk away and 1 minute later it is all ready to use.
Actually there is a way in restarting an iOS device. It's better known as 'soft reset'. Hold down Home button and lock button for a few seconds and your device will restart.