I also don't see a strong link between training at a competitive activity, and releasing a product. Obviously, training against real opponents is crucial.

But the world is full of half-baked products, especially software. If you show up to your first tournament and lose pathetically in the first round, no one is going to prevent you from attending the second tournament. But people will permanently write off your product if it is half-baked. Or even if your product is good but the release process is half-baked.