And when people thought the skin got cancelled an overwhelming amount of players got mad as well. Just cause a large amount of players dislike the skin, doesn't mean their isn't a large amount of players who won't enjoy it. Take Teemo, lots of people hate him and want him deleted but lots of people still play him.
Most people, seeing the name "Steel Legion", expected something similar to the much requested Hextech Lux. It shows the side of Lux that, in all of her other skins, is completely unrepresented -- the intelligent side. Listen to her second /j and tell me she doesn't have book smarts.
When I saw the name Steel Legion Lux, and saw one of IronStylus's posts about it saying it was "function over form", I was excited. I thought IronStylus had taken the Lux we all know and love, and taken her magic away, and instead given her some made-at-home tech that produced the same effects. Like if she had access to the same junkyard that Rumble used to build Tristy, and using her knowledge of science and physics built equipment that let her bend light and fire a gigantic laser beam. As if she was inventing a whole new field of science, and had just built the first working prototype.
Instead, we got an example of what would have been developed years down the road. Mass produced, highly refined machinery that would be standard issue on any robot army. Which then feeds into the "all of Lux's skins are military!!" noise.
So, to get back to your point, you are making it sound like there are only 2 camps for Lux -- those that want Steel Legion Lux as is, and those that don't want it at all. You're ignoring the 3rd camp, which is in fact much larger. The people who want Lux to get the skin, but that are unhappy that the theme has almost no departure from the other skins available to Lux.