I can understand why you'd be hesitant to burn down your cousins the Koroks accidentally. However I doubt that you can burn down Hyrule Castle on accident. Grass fires don't melt stone blocks.
I really think it would take at least a little planning to be able to pull of an apple-picking...
So you can get to Ganon and potentially beat him in 10-15 min (if you have mad skills.) But you can't 100% the game in under a week.
I think the point is to showcase that the world is completely free to be explored as the player chooses. However, I doubt that the route straight to ganon will be...