I suspect ai adoption and development work will be driven by jevon's paradox for the forseeable future. It won't be exactly the same work as before, (see here: fixing software flaws found by an AI), but it'll be interesting.
Banking software is extremely regulated and controlled, both by governments and within the industry itself (one small mistake can wipe out entire institutions within a day: https://en.wikipedia.org/wiki/Knight_Capital_Group, banks are extremely risk-averse with technology). So likely they were comfortable using agents to _read_ their code but not to write it.