Yeah, every day you are reminded because someone forgot their apple adapter. It's nothing but pathetic.
Optical drives and floppy discs were obvious, they were never used on a daily basis when they were removed and that they remained so long in laptops (macs included) is just astounding. But something like Ethernet is just ludicrous. Unfortunately, if you want a slim laptop Ethernet will have to go - but it sure as hell will be missed in the coming decade.
Non-replacable batteries... Another milestone? No one was stupid enough to come up with that before apple, and thanks to that we all have to throw away all of our devices after a few years. But who cares, right?