Re: Audio jack
I've always found connections to a phone a problem when on the move and have been using Bluetooth phones for over 10 years because of this. A 3.5 mm jack has quite a bit of leverage on a phone an can easily lead to considerable damage by accident. But it can be useful to plug the phone into a speaker (if it doesn't support BT or if the codec support is shitty) so the adapter is a must.
On the whole, like removable batteries, I suspect a lot of people will bitch about this change and buy them anyway.