ELI5: Why are golfers still required to enter a correct scorecard?

In regards to the recent Jordan Spieth incident, of which his incorrect scorecard disqualified him from a tournament… I mean, this is 2024. Every shot he takes is being recorded and discussed. Everyone in charge of running that event already knew what his score was, so why does an error like this erase his results? Is any other sport like this in which the players can be disqualified for being bad at math?

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