Yeah, that's the problem with using technology that some people miss - it needs to be interpreted, and you'll always end up with cases at the margins (in cricket, for instance, even modern frame rates aren't always good enough, so on a run-out there'll be a frame with batsman out, bails unbroken, then the next shows batsman in, bails broken, so no clear decision). So it doesn't necessarily solve problems, and can create new ones. At least cricket has the idea of 'benefit of the doubt' to fall back on, but even that doesn't always make decisions straightforward. You need some idea of what to do when there's no clear decision from technology.