This isn’t really true. If it were the financial world would be incredibly unstable and untrustworthy, and nobody would keep their money in banks.

Banks do tend to be behind the leading edge because their systems are thoroughly tested and have to be stable. They have to be regularly audited and there’s a lot of oversight. Change control processes are inherently slow. Given a choice between rapid and flexible or deliberate and reliable, banks will take the cautious route.