Because people will buy that phone and keep it much longer. When phones had replaceable batteries, they needed replaced after a couple of years because they were terrible. I'm now on a several year old pixel phone that I'm happy with, but eventually the battery will wear out and I'll have to replace it. Google likes it that way.
Battery tech has gotten a lot better every year over the last hundred years.
You don't have to replace the phone. You can go to some repair shop and get the battery replaced. It will be several times cheaper than a new phone.
Very few people do that. I don't. Because a) general software enshittification makes me need a more powerful decice anyway, and, more importantly, b) people are just happy to have an excuse to get the the new shiny.
I have been using the Pixel series for years and after a year of use the battery capacity is noticeable worse for me.
I'd just like to pay 100-300EUR to replace the battery with a brand new one but the device should still be IP68 water-"proof".
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I have a few IOS devices, you know what prevents me from using them?
It's not the battery, its the lack of OS updates. I can't install new certificates, or get access to app stores. They're useless.
In fact, the lack of a replacement battery has never prevented me from keeping something working, only software or physical damage.