I guess this potentially eliminates the need for goal umpires completely (and reduces the need for boundary umpires by determining if a ball goes over the boundary line) once this is implemented? Guess they would still need the goal umpires to determine if the ball was touched through or hit the post, unless they leave that decision up to field umpires / have video reviews of everything.
Not entirely sure what use it has otherwise except for possibly determining stuff like how far out a set shot is for broadcasters. Maybe they could use it to determine if a kick went 15m+ (a free that is often missed) if they can get the info instantly, that would actually be beneficial.
I thought this technology was available so glad to see they are trialling it, but still not exactly sure they will utilise it well.