The CG uses Fortress anchors on all their rescue boats. They probably spent tens of millions testing anchors to make that choice. They don't anchor out overnight so they may have been looking strictly at holding power and not other criteria such as resetting ability. They also use rope rode on a spool in the anchor locker forward. The anchor is stored on the cabin side without the rode attached.
I am not sure I understand the idea that a fluke style anchor can set incredibly well, but for some magical reason is unable to reset. I understand the arguments why anchors may not reset. However, it is not my experience that Danforths don't inherently reset.
On the other hand, the more significant issue that I see is the problem that chain wraps the anchor, fouling it causing it not to reset. When I anchored in tidal areas or with wind changes, this was always my biggest concern with chain. And this has happened with chain and Delta, Bruce and the Danforth.
I don't remember a case where line only has wrapped my Danforth perhaps for the simple reason that any force on the line lifts the line off the bottom preventing the line from wrapping the anchor.
Chain drags on the bottom picking up everything off the bottom and wrapping anything in its path. This is the number one reason I don't use chain in sea weed. Where wind is against the current, chain rips the sea weed off the bottom and current drags the sea weed between the chain and bottom. On a reset, this big glob of sea weed invariably prevents the anchor from resetting. Been there done that.
This last 5 month cruise without chain has convinced me that chain causes more problems than it solves. And the graphs PDQ provided indicate that even a fix shank anchor can run without chain as long as it uses at least a 6 to one scope.