I asked a couple people on chat and one said they supported it, so I decided to interpret that as unanimous harmonious agreement and made the change. Being as it's only one line on one page, I figured it was anything but harmful, unlike most of my past projects which involved large overhaul of half the wiki.
As for the actual rationale, I feel that if superusers are expected to be treated like any other user, I think name highlighting undermines that philosophy by blatantly presenting "hey, my name is a different color, so I have authority." If someone needs to find a superuser, the search box is a click away.
Next time, try to make it more official and documented. The problems with discussing it in chat are multiple: not all users are represented, there is zero documentation of any opinion from any person, and there is no forum for debate/disagreement. That said, I decided that I don't really care about highlights any more. — TehAnonymous<3 22:28, February 3, 2013 (UTC)
Eh, this is a controversial topic that has been formally discussed several times before. They weren't doing harm, and it was last agreed over a forum that they help distinguish users that can help with tools that they have normal users can't (i.e. block, delete, protect etc.)