You're right, it wouldn't be and I'd likely ask "why did you use a text file and not a database?". It was more about getting him to think deeper than surface l

You're right, it wouldn't be and I'd likely ask "why did you use a text file and not a database?". It was more about getting him to think deeper than surface level: if I open a file, that means it locks so I need to then think about what happens when someone else tries to open the file etc. It was a contrived example tbh.