The end result of user-replaceable batteries is, unfortunately, a device that's thicker and heavier than it needs to be, or a device with less capacity than it once had.

Making a battery durable enough to be easily swappable requires enclosing it in a protective case, which in turn reduces the internal volume available dramatically. (Taking an 8mm think battery and enclosing it in a mm of plastic while keeping the same thickness reduces capacity by a full 25%.)

It's going to cause havoc with devices that use T and L shaped batteries in a attempt to maximize internal volume, as well as with the current crop of foldable phones who currently put cells in both halves of the phone.

The "no special tools" requirement is also going to bite water and dust resistance (as mentioned).

All that said, I suspect manufacturers won't mind the new requirements, since the resulting loss of capacity means that, once again, they'll be selling (and we'll be carrying) extra batteries to make up the difference.

Thanks, EU.