Windows 10 is already capable of being taken anywhere and being instantly available. I recently built two new systems in my house (a budget-oriented desktop for my mom, and a high-end workstation for myself). Both of them boot in under 15 seconds and exiting sleep mode is sub one second with the monitors taking longer to turn back on. Furthermore sleep mode is very light on battery life. I have an older Panasonic Toughbook that I typically turn on at the beginning of a trip and keep in sleep mode when I'm not actively using it. I can very easily get many hours out of it and that's with being instantly available. All of the above is and has been achievable with x86 hardware for years now. We don't need ARM to do so.