So following the Khawaja decision, I'm interested in what DRS apologists think the protocols should be for overturning non-LBW decisions at this point. It feels like there's been a lot of back and forth this series over how it should function, from the umpire seemingly using a lack of evidence on the tech to support the umpire's decision to overrule (Trott decision) to the umpire needing clear evidence that the umpire's decision is wrong to overturn, which basically seems to amount to absolutely no doubt at all, no matter how slight, or the on-field decision stands.
I'm inclined towards the view that, if DRS is here to stay, just having the third umpire make a decision completely independent from the on-field ump and going with it is better than what we have now. Basically treating the review system for non-LBWs as being the option of having the decision made by a completely different umpire twice per innings. Because right now the "evidence to overturn" system just seems totally non-functional for anything other than LBWs. For LBW at least the decision is fundamentally subjective on some level, the umpire thinks it's going to hit the stumps or he doesn't, and something that is just flicking the stumps could easily be out or not out and both decisions are fair enough. But with edges there's a clear problem where an unexplained sound or deflection makes it basically impossible to overrule a decision. The only way I could see the umpire's call being overturned is when it goes against the batting side, ie the umpire thinks they've missed it and hotspot, being the only totally conclusive piece of tech available, clearly shows an edge. But for decisions that favour the batsmen it really feels broken right now, even if you ignore any other issues with it holding up play, impacting spectator enjoyment etc.
It's not just that you can miss the ball by a couple of inches but be given out because there's a random noise that creates "doubt", but that the batting side is punished by losing a review even if reviewing it was totally reasonable.