There's another crucial point here - if you can't get acclaim for your idea without having the product as well, that's a major motivator to get the product work

There's another crucial point here - if you can't get acclaim for your idea without having the product as well, that's a major motivator to get the product working. So sometimes stealth mode is a good idea in order to make yourself get developing, rather than in order to keep the idea itself from the outside world.