The box was a nice touch in the tradition of thoughtful Apple packaging, and for horological fans to whom "box and papers" has meaning. Apple tried to position the Watch in that vein, but I think they've shifted away from that. I don't think most would notice or care anyway, and thus the packaging has changed.
Some may miss the wall adapter more, but it's probably unusual for a user to lack access to a USB port or other wall adapter nowadays, like the one bundled with the iPhone that a Watch user already has.
Personally, I'd rather pocket the $30 or whatever and put that toward a more useful multi-port adapter from a 3rd party of my choice. The cube adapters and iPad adapter I've accumulated along the way sit unused along with extra Lightning cables in their boxes. Single-port adapters are really kind of an anachronism now, when most people have multiple devices, and USB charging has become the standard.
If environmental concerns were such a priority, they'd go back to the unbleached cardboard they used during the PowerMac and PowerBook era.