I’ve never been in banking, but I’ve been in games (AAA) and biotech most of my career.

I agree with the previous commenter. It isn’t about breaking things out even moving fast (in my experience), but about getting “the juices flowing”.

I’ve found that when there’s a request for some new tool or thing, people have a very difficult time defining [all] the real world needs. They know they need X, but don’t remember - or even realize - they also need Y, Z, etc. Or worse, many people have been conditioned through corporate culture that they can’t even ask for things that would make their lives easier.

Getting something basic in someone’s hands quickly with the desire of creating a loop of feedback, feature, feedback, … gets the end user more focused and engaged with the final product, which gives the engineers more focused requirements. I’ve found it also gives the engineers the opportunity to make suggestions and get more invested.