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> Maybe not a great tradeoff for something needed once every 2-3 years.

The case for user-replaceable batteries isn't just to be able to replace them when they wear out. It's also to be able to carry a spare or two for when you want to use the device for an extended period of time. (No, external power banks don't really address this use case).

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> external power banks don't really address this use case

Can you elaborate on why not? For me they address it far better than swapping out the internal battery, since you don't have to interrupt that extended use by powering down the phone to make the switch. They're also way easier to recharge simultaneously, without needing a bank of dummy phones.

Because with power banks, you either have to keep it attached to the power bank during use or wait for the bank to recharge your phone.

The best solution to this I've found is the moto Z series of phones. Integrated battery and an external battery that attaches to the back with magnets. I don't really use the other mods but there's a battery attached to the back of my phone all the time and a spare in my bag.

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