How doesn't it matter? The hope XC and Bulb had a "proven" track record in all other disciplines to, I've lost count of the amount of old Hopes I've ripped apart!
I've also heard the phrase "if you can break it, we'll fix it" before. So what happens if trials riders start using the hubs, and start ripping them so shreds? Will they still honour that statement? I doubt it very much.
To be honest, I've never been a fan of overbuilding anything, I would much rather it be designed with the forces that are to be applied to it in mind.
I think you will find that people don't just buy things because they are a "trials" part, but more on how the hub has stood up to lashings of abuse by riders. All the succesfull freewheels have a proven track record, whereas the I9 does not.