For my interests, I guess I can't see the value in a mobile user; maybe in some really one-off cases in my interests it would be prudent for a unified view? The most I've seen a Reddit board do is have fancier sidebar links. My thoughts when it comes to having differentiated Reddits are forum-like features such as shoutboxes, hyper-specific file uploads, or even flat-out disabling Karma on that board (dunno if that one is already possible).
Sure I can have a forum with all of these features, but not the ease of use or traffic that Reddit gets. Like I hope I got across in my previous post, still undecided and hesitant on Reddit as a whole, even to this day.
The value of a mobile user is that a huge proportion of social media usage comes from people using their smartphones. I appreciate the quirky designs for a few subreddits (r/mildlyinfuriating is a standout), but I have my user settings configured to ignore custom CSS on desktop, just for ease of use.