Producers got away with going to non-replaceable batteries because "most" people replace their phone before the battery wears out. Only a portion of consumers have a problem with it.

I'm sure there's a few of us that can comfortably get six years off a phone. In fact the phone I'm currently using is coming up on three years. I could probably get another three years out of it, but I'm going to have to replace it soon because of battery wear.

Non-replaceable batteries are bad for the consumer and bad for the environment. It forces obsolescence putting more financial strain on consumers and increases environmental impact with higher production and waste.

A phone replaced before three years could be sold second hand with a battery replacement. Otherwise consumers could keep a phone twice as long. So they're basically doubling the rate of production and waste to squeeze as much money as possible out of the consumer. Then there's zero regard for the environment. But you know that's typical of how corporations do business, rape the Earth, screw the consumer. We have to keep a leash on these guys.