Why would the filename minutes from the meeting not be a good file name choice

The most likely answer would be if you ever need to find that file again, you will have a hard time. The name "filename" is not distinct and has no unique relation to the meeting. In the future, you may remember that you made a file before a meeting but you won't know what meeting the file was for unless you actually look inside the file which will just take up time and become a hassle.