For me, and for nearly everyone I know, thinness is far more functional than an ethernet port. As is weight, a pound is actually a lot!

Ethernet ports are easy to add as a dongle, you can't do the same with thinness. I really only need ethernet in fixed locations, and where there I already have power, and that's the case for most people.

It's totally cool that you have different needs, but it's not cool to misascribe that to "looks."