I terms of installation they are actually a PC. Just load your favorite distro on a USB stick and install it as you would on a Desktop. For me Ubuntu is working great on an older Surface Go, including touch. The keyboard cover is highly recommended of course.
Being able to form armies that move as one is already a great improvement that could reduce a lot of managing late game. Same with reinforcements which will find their way to the front alone in Civ VII.
Yes but where is the hydrogen coming from? Also hydrogen cars are less efficient than battery powered EVs.
You can remove the Google search bar and replace it with the one of your choice.