I take your point whatnext - but you haven't said anything to support the theory of not practising the technique.
I disagree that you'd suddenly forget the skill - especially if it's something you practice along with other emergency drills. Spin recovery would surely be a question of aerodynamics and the principles to recover the aircraft would be pretty much the same for every type.
As for not saving a crash - well it could have saved a life here very recently. And that was way outside the traffic pattern. Spins do happen outside the circuit - and people do get killed. If your aircraft allows you to practice recovery safely - it is foolish not to in my opinion.
Besides - spinning is heaps of fun!!