I have a 2015 traditional and the neck on that sucker is massive. The extra width is definitely noticeable to me, and I wouldn’t say I prefer it, but it doesn’t bother me. If I’ve left that one unplayed for awhile it does take some adjustment time to get used to it again, but it’s not really a big deal and the guitar as a whole is great.
I also really like the adjustable nut, mines never given me a problem and the idea that it’s a tone suck sounds fine on paper, but it just doesn’t play out in real life IMO. That said I have been curious to see what a regular nut with a wider spacing would feel like.
I don't own a 2015 as I dislike the crap features Gibson tried to force on their customers, and I hate that way of doing business -- but the wider neck (slightly wider, to be accurate) is, IMO, fine. If anything, I like it a bit more, burt I have fat fingers and always like more room than most people do. Why Gibson chose to do this on one of the world's most popular guitars, which many buyers go for because of its longstanding specs, is utterly baffling. If they had beta-tested with buyers -- if they actually cared or respected buyers -- this would have been DOA instead of a short-term, fairly epic fail. As for the adjustable nut, etc, well, wow, that stuff is garbage.