Its required knowledge for financial literacy.
Its more than just balancing the check book. The reason's behind why you do it are many. One is in creating a documentation path of evidence you can fall back to if there are any discrepancies, which do happen both as mistakes/errors as well as maliciously.
Rare as they may be, having a teller add an extra 0 to the end of a $100 payment when processing is enough for most people to find out the hard way why you need to do these things a certain way.
If the bank refuses to correct the issue, you can take them to small claims court and use your documentation as evidence in support along with other evidence such as invoices, etc. Even memorializing something and sending a copy to the person for their documentation can be considered implicit acceptance when they do not respond which bad actors often will not.
If you don't have this, its your word versus theirs. A he-said she-said, and there are presumptions in law that may force you to pay if you do not know.
Things like failing to dispute amounts/demands for something owed within a certain period of time, may make you liable for remedying a non-existent credit/debt when it goes before a judge.