I think the sports where technology works best are more technical - cricket is a prime example, but even in rugby the technology is often used for technical aspects (grounding the ball etc). It's not great in football because too much of it is subjective and even with the bit that isn't (offside) the calls still look like bullshit at times.
I'm still not having it that Mane was offside in the derby game where Prickford ruined van Dijk's career.