For now, there are only a few things that can be restored after a reboot.
The ability is still quite limited but the outlook looks promising in the coming years. However, certain companies (including Microsoft) are working on ways to allow you to remain in place so that you can go right back into what you are working on after a reboot. Have you ever been working on something in Windows 10 when it suddenly insists that you restart for updates? You may not want to drop what you are working on.