I actually do think the trick taking mechanic suits a pirate game, although it is an abstraction it can 'represent' some 'force' (the cards/tokens/whatever), being used to achieve a goal of some sort (the trick).
You can have various forces: Treachery, Brute Force, Booze etc, which are all 'suits'...and the goal being booty, or ships, or whatever.
So while it is certainly abstract - I do think it ties in reasonably well.
While you could easily have a trick taking game about Elephants managing equity accounts, a pirate theme does make more 'sense' when considering the nature of the mechanic.
Taking a trick in a game can be an aggressive process, it can be sneaky, it can be well planned and it can fluked, all thematic of a pirate-ish theme (many others as well of course).
Done well a trick taking pirate game would be great, I don;t think I have played any though

Hehehehe
Good discussion and review though Don! Thought provoking and interesting.
Cheers,
Giles.