> by the time batteries wear out, most people are going to want a new a phone

Why? My phone works almost perfectly still three and a half years after I bought it. Except the battery lasts shorter.

If I go to battery health in settings it says:

> Important Battery Message

> Your battery's health is significantly degraded. An Apple Authorised Service Provider can replace the battery to restore full performance and capacity.

> Find Your Service Options

Aside from my current phone, I also have a very old iPod Touch. That old iPod Touch would have been usable still as well, if it wasn’t for the fact that it takes somewhere around 10 minutes of active use until it goes from full charge to zero charge. In other words, unusable for bringing with me anywhere plainly because of the battery.

Replaceable battery would have been great. Both for my iPhone and my iPod Touch. Even if it meant they would have been a bit thicker than they currently are.