I can''t argue with you since I''ve only seen the Spade up close once. But, I do remember seeing the pin and deciding that, though unlikely, it could come apart. There was also concern on this issue in a recent Practical Sailor.
Sounds like quite a sales pitch for the Spade. Either you have one and are emotionally attached to it, or you are connected with the company that imports them.
Regardless of whether the pin is normally under tension or not, a single piece anchor does not have even the possibility of coming apart. As I said, I sometimes anchor in extreme circumstances, and for me, a one piece anchor with lots of chain is all I''ll use.
This is one of those subjects that for whatever reason, incites strong loyalties. Obviously, neither one of us will convince the other, so let''s just say that they''re both good anchors (though the Spade as yet hasn''t earned a reputation) and properly used, they''ll keep you put.