It won't be a casual device that you want to put on/off to check the news while saving battery, so it's not a contender for the smartphone. Two hours is not enough for daily work, so it won't replace the computer. Meaning this is a routine device that you use once or twice per day then forget about it.
Can’t you plug in it? My Windows laptop gives me about 45 mins tops. My Quest is never charged when I go to use it. It only gets charged when I use it.