Speed could be the reason for some/much of the reasoning…but my thinking would probably lean more towards issues of higher maintenance and an overall lack of familiarity. Also, consistency in shaft material doesn’t generally work in wood’s favor from the-get go. Getting very closely matched material is possible but is the product of much sorting…and the future availability of more of the same can become problematic. Anyhow, for any given spine, the same species of wood will have a range of physical weights…thus a lighter/faster end of the spectrum exists, as does the heavyweight dog at the other end.
Speed is kinda a subject in itself…that also speaks directly to the potential of any given bow. In the past, I used to keep bow/arrow combinations around that optimized speed potential, were very squirrelly and unforgiving, but that’s precisely what I wanted from them…the challenge/discipline to shoot something that would “exaggerate” every flaw, instead of forgive/hide them. But aside from that, I consider speed just another factor in a practical/usable/optimum relationship between bow/arrow/shooter that’s suitable to my purpose…and function harmoniously. This doesn’t mean that anyone else will be as happy shooting my arrangements, or that I can’t press any envelope further…but it works for me.
As a bowhunter, I never feel any handicap when I’m shooting wood, but they also used to be the only option for target shooters…and proved up to the task. Not everyone can make a fine wooden arrow. Not everyone can maintain their straightness…and not everyone can tell the difference from one to the next…but that’s not the arrows’ fault. Enjoy, Rick.