| Aircraft dynamic stability (wing + tail + aircraft cg position) is very different than a free rotating wing on a pole (no tail, gravity play no role in wing rotation unless the boat is rocking).

I disagree. Firstly the aerodynamic center needs to be aft of rotation, or the wing wont feather/wont be stable

And why is there no tail?

| Best case scenario is a symmetrical wing rotating on a pole at the aerodynamic center of the foil so there is no varying pitching moment with wind speed (CM=0). But also the CG of the wing need to be at the center of the pole otherwise when the wave rock the boat, it would create a moment that will rotate the wing and create lift, so a driving force and more boat rocking moment.

If the lift is opposite the moment, will that not dampen?

|But still, nothing to do when the bearing jam! Something will go wrong!

Agreed

| PS They use crane to remove rigid wing from a boat ...

In race boats, where the emphasis is on light and expensive, the crane makes sense.

But a robust, easily repaired, cheap solid wing does not need kid gloves. Perhaps?