To keep a maple shaft smooth, you have to either use a glove (makes point moot) or sand it down when it gets sticky from skin oil and chalk which means loss of material. You don't have to worry about that with CF as a quick wipe down restores it and without any loss of material. It is also noticeably more slicker and less prone to get dirty, making your stroke more consistent regardless of glove usage.That's one (unless you like your shaft whippy or soft).
I don't think thermal expandability is a problem with maple. And maple shafts are easily kept smooth.
I doubt that difference, if real, is noticable.
I've never heard of a maple shaft wearing out or "going bad".
As I said before, that may be true, but only to a tiny degree.
In other words, I think maple shafts perform pretty much as well as CF shafts, and liking one more than the other is mostly personal preference - but of course personal preference is important.
Marginally better is still better though. Now that said, I absolutely agree that one can use a maple shaft as effectively as a carbon fiber one. Objectively however, carbon fiber is better shaft material than wood as it is more strong, rigid, durable, and slick.