> I'm actually amazed that they still bother to maintain this legacy versions.

According to my traffic stats (moderating ~400k subscribers), old + mobile web frontends make up about twice the traffic of new frontend. Apps are by far the most popular, about ~3x of all web frontends combined.

I do not know a single person that moderates a 100k+ subreddit using the redesign, everyone still seems to be using old + modtools + enhancement suite. Personally, I believe this is the only reason they didn't kill it already.

Edit to add: The new frontend is the default for logged-out users, and it still makes up half of old. If that isn't a failed redesign project, I don't know what is.