It's more that the more technology you use, the more it slows the game down, so people are reluctant to use it any more than it absolutely has to be. One concept that might be helpfully borrowed from cricket is the idea of "umpire's call" - rather than spend ages trying to achieve black-or-white certainty on an uncertain incident, they accept that things that are in a grey area according to the technology should just go with the original decision, save the technology for the obvious mistakes.
But the most necessary change to the rules of professional football is far more low-tech. Namely oven gloves. Or at least, force all outfield players to wear leather mittens. It would stop the epidemic of shirt-pulling that just shouldn't be part of the game.
Denmark were great, Schmeichel in particular was terrific - but at the same time they can hardly complain about a dodgy penalty when like most teams they are no strangers to the dark arts. If they behaved well then they would have a point, but if you play with fire you can't really complain about getting burnt sometimes.
And shining lasers at players' eyes is completely out of order.
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