Way to ignore my point.
And you're implying that I want standardised batteries in phones. Phones are too small slim for even AAAs. But there are many devices that do have the room for AAAs or even AAs (controllers especially), that really should have them.
Well, actually I do want replaceable batteries in phones. I accept that they often will need to be custom shapes and sizes, but that's better than them being glued in. Oh, and replaceable batteries were common well into the mid-2010s. My previous phone was a Note Edge and its replaceable battery extended its life to last six years (with good battery life as I just replaced the batteries). And even then, actually back in the 2000s, despite shitty propriety charging ports, phones then often did share the same batteries within manufacturers. I still have a Nokia 808 PureView that has its own battery, but it could also use other Nokia batteries.
Let's this be a warning to you about talking out of your arse.