I feel that it mostly boils down to system synergy for each owner. If you have a tight, clean, revealing system I can see where some might appreciate the longer decay factor of a softer wood ZMF, whereas if you have a warm, romantic sounding chain I can see where some might prefer the tighter, snappier sound of a hard wood.I've heard so many differing reports on this, that perhaps it's best not to comment on it without firsthand experience. I know someone here who owns a blackwood VO and says it's his favorite ZMF. Another owns the silkwood VO and says its HIS favorite ZMF. And yet another who prefers medium density woods in general because they straddle the line.
All I know is that from the Hot Cup Summer offerings, that walnut crotch burl VO would look mighty fine next to my Pendant SE
And then of course you have some owners who do not believe in such a thing as "too warm" or "too analytical" who may prefer a softer wood on a warm system or a harder wood on a brighter system.
Finally when you factor in the various ways we each hear things, combined with the various contradictory reports out there, it makes sense.
I feel that the fine folks at ZMF cover all of the bases between the various wood types and pad options, there is something that will float most listener's boat.