Even if it's in season doesn't mean your climate is the best place to grow it.
If it was the best place, then it would be competitive on the open market, and produce from your area would be the primary produce on the market - without any hokey social movements.
That's only true if you want to claim that the "best" place to grow $randomFruit cannot be more profitably used doing $randomThing. Downtown San Francisco could be the world best microclimate for tomatoes but it still probably wouldn't be worth using the land for that instead of an apartment.
If you're buying local pineapples in Duluth, I can see it would defeat the purpose.