I don't think it is.
Ignore for now the decision of the umpire. At the moment, if the ball is flicking one stump, the technology is not used - either to give someone out or not. I've always understood that the reason for this is because there's some uncertainty in the 'predictive' element of...
I agree with you. But, at the risk of going further O/T, I don't like the inconsistency in it. They say that there's a potential for a bit of inaccuracy in it (hence umpire's call) but it's not applied equally.
At the moment, umpire's call is only if the ball is hitting by half a ball's width...