Collecting data is easy in today's world. Every element of the game is automatically counted and logged. Player motions, speed of ball, game time, etc.
But ...extracting useful and insightful information from data is the tricky part, which is why the best data analysts earn the big money. There'll always be chancers / less-skilled people who will end up drawing useless conclusions.
Because the top teams are pretty closely matched (on a good day anyone can beat anyone), gains of only a few percent are literally enough to make a big change in the match outcome.
Forgetting some of the less savoury stories, Dave brailsford and his team made huge improvements in GB cycling teams, with olympic medals galore, by using such analytics to squeeze 0.5% here, 0.25% there.
Believe me, it can make that extra difference!