It only matters if you plan on keeping this phone for over 2 years... if you’re going to get a 12 I wouldn’t care since you’ll upgrade before it’s an issue anyways
Battery life, - excellent. I go about 2 to 2 1/2 days between charges. I usually throw it on the charger between 5% to 10%, a couple of times I ran it down to 1%. Which is typically what I have done with all my iPhones.