I actually read this as sarcasm and then I depressingly remembered this was actually the case. What on earth happened to computers.
People wanted them ultra slim, the old one was great because it was a pure rectangle, even had a charge indicator on it.
My 2013 macbook air is plenty slim and light but changing the battery is just a matter of undoing a bunch of screws and clipping it in. Takes <5 min. I'm not sure there are any real world advantages from glueing the thing in?
Most people don't change it, plus Apple went ahead and got drunk on control (UX consistency!) and on the idea that hardware is just the physical part of a service (experience!) that they provide.
Reminded me of this fun video in the reddit thinkpad community of someone "reloading" their R500 swappable bay.