I work for a major US bank. Regulators frequently (multiple times a year across different areas of the business) have detailed discussions with us about specific technology choices, especially regarding issues that could affect data integrity or disaster recovery.
I have not seen regulators require a specific technology, but I have certainly seen them questioning technology choices. There may be some truth to echopom's claim (made regarding European regulators, nott US regulators) that regulators can be bamboozled with meaningless claims to have "redesigned" a system and "invested" in it... I couldn't say because both of the US banks I have worked for have taken even gentle hints from regulators EXTREMELY seriously and would not have attempted to bamboozle them.
I have not seen regulators require a specific technology, but I have certainly seen them questioning technology choices. There may be some truth to echopom's claim (made regarding European regulators, nott US regulators) that regulators can be bamboozled with meaningless claims to have "redesigned" a system and "invested" in it... I couldn't say because both of the US banks I have worked for have taken even gentle hints from regulators EXTREMELY seriously and would not have attempted to bamboozle them.