Agreed. I was taught (and forced to) balance my checkbook as a youth, but starting around 2006 when I switched to a bank with a website/portal it became essentially busy work. I would still probably recommend doing it (or an equivalent personal tracking) if you run balances near zero so you don't overdraw/overdraft, but for most people it's only a 30 second exercise to pull up the website or app and check your balance. If you're worried about bank errors then maybe self-balancing might be worth it, but that's not something I worry about and even if I did I don't expect my personal balance to be accepted as any sort of evidence.
Since it became possible to deposit a cheque by photographing it from a banking app, there are also fewer surprises from the other side: the busy plumber might not find time to drive to the bank during opening hours, but will pay in any cheques they receive the same day through the app.
(From what I remember of my parents discussing this, they would be annoyed if someone they'd paid by cheque didn't deposit it promptly. This was probably before online banking, but when they could conveniently check their balance at an ATM in most supermarkets.)
