Audience asks whether setting up this architecture is too slow to justify to the business compared to a typical Rails jumpstart. Krzywda: Rails lets you be very fast for the first few weeks, then dramatically slower — a trap for both business and developers. His mission is to simplify DDD tooling so you can be just as fast end-to-end. Most of the time is getting used to thinking in commands/events, not typing. In legacy projects, start by introducing one event at a time (e.g. price-changed → send email to clients) — that's already easier than the 'Rails way'.