Great question. Two things you're aiming for with a regulatory submission: 1) Get it approved. 2) Receive back as few rounds of questions as possible from the case officer, as each round delays approval. You can improve 2) by painting a very clear and concise narrative around key concerns pertaining to the particular application you're submitting. Microservice architecture helps to paint that narrative (for CCOs that understand them) as at the high level, it addresses the key concerns (primarily data protection) with simple to convey concepts such as data segregation, service ownership, etc. The implementation of those controls is not as simple, but for the regulatory application, all that matters is that they are sound in practice and simple to convey.