> What if it accidentally schedules another flight in the same time and place?

Flight plans are not responsible for flight separation. It is not their job and nobody uses them for that.

As a first approximation they are used so ATC doesn’t need to ask every airplane every five minute “so flight ABC123 where do you want to go today?”

I’m staring to think that there is a need for a “falsehoods programers believe about aviation” article.