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As far as I can tell, it's entirely that. The things the author cites as how mobile banking supplanted going to the bank (paying for things with debit cards, getting your paycheck direct deposited, etc) have nothing to do with mobile banking. They are all just as you said: we live in an increasingly cashless society, the only reason to go to the branch is to deposit or withdraw money, so the need for tellers has gone off a cliff.
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Yes, exactly my reaction. Other than maybe to open an account in the first place, the only reason I ever went into to a bank even in the pre-internet, pre-smartphone era was to deal with cash.

Checks could be deposited in the deposit drop, or later at an ATM. My payroll went to direct deposit as soon as that was possible.

But to get cash, before ATMs, you went into the bank, unless you had check-cashing privilges somewhere else (supermarkets used to offer this). To deposit cash, you went into the bank so the teller could count it in front of you and agree on the amount. It was risker to deposit cash in a deposit drop or ATM.

The move to cashless transactions for almost everything, and the resultant rare need to carry cash, is IMO the main reason why we don't need very many bank tellers anymore.

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Something that only came with the banking apps was opening of accounts via camera based identification and other security critical stuff, like 2fa for transfers, resetting card pins and setting other security features.

It's also easier to scan payments via app than go to the bank, something that is only possible via native like apps

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In which way is the cashless society due to smartphones? Cards did that already before Apple/GooglePay were a thing.
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P2P apps (Cash App, Venmo, etc) that have filled the gaps for transactions that were typically tricky to use cards for.
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