It seems like it comes down to intent. If Samsung has released a prototype device (could be the exact same device but labeled as prototype), then people are likely to be more forgiving. There is a certain level of expectation that a prototype has known shortcomings or incomplete consumer-level testing.
Of course, this means that competitors probably have hands-on with your device as well.
Edit: See below comment for insight into situation
So it's not only "who does it best".