It’s not about need, it’s about want. Why would anyone need a fiberglass backed recurve when a longbow will work? Why does anyone need a longbow when a selfbow will work? See where I’m going? I have nothing against wood arrows, and the thousand-plus shafts in my basement can attest. But how boring would life be if everyone liked the same things?
As far as carbons are concerned, the last dozen hunting shafts I bought cost less than a dozen weight and spine matched POCs from the large traditional archery suppliers. I’ve been shooting carbons for about 25 years now and haven’t found them any more or less dangerous than any other type of shaft. Twenty-plus years ago when pultruded carbons were the norm, there were some safety issues. But that was a long time ago. Today’s cross weave carbon shafts are tough as nails, and when they break they don’t produce “shards.” They break clean, just like a wood or aluminum shaft.
In the end, it all comes down to personal preference.