I wonder what percentage of the user base is wanting this? Seems like most people wouldn’t care about it at all.. a battery seems to last a few years and costs about $100 to replace with a genuine part including the warranty of opening watertight phone and maintaining its integrity.
quite a lot of Samsung users with the recent years of battery swollening that instead of 100 dollars can be replaced with easily available 30 dollar battery if they were replaceable. Iphones could stop throttling their phones once the battery starts dying do you wouldn't have to buy a new one (they will still throttle but for different reasons)