I absolutely despise that Apple made non-replaceable batteries the norm, and most of us have begun to accept this as "the way things have always been". Every cell phone I had before the iPhone came out had an easily replaceable battery before we all became a slave to Ives' "Preciousssss" demands for minimalism.
Edit: Folks seem to be misunderstanding why I brought up Apple. I in no way think they are now worse than any other phone manufacturer when it comes to irreplaceable batteries. But AFAIK the iPhone was the first phone to have a glued-in battery, and that has since become the norm. They have essentially helped lead the way in convincing consumers that replacing the battery shouldn't be an easy, user-accessible operation.
I’m not sure how important it is. My first phones with replaceable batteries sucked, the plastic cover would always pop out and was generally a point of failure. And it never did me any good, as most phones died before the battery became an issue.
Today I’ve had an iPhone for 3 years and the battery is still going strong. If I need to replace it… I’ll just find someone who can replace it, easy enough. Sure it would be more convenient to be able to do it myself, but if it happens once every 4-5 years I honestly don’t care, and will take the daily convenience of no plastic cover instead.