I'm pretty sure DDD was not just Martin's idea and it's still pretty new and evolving even today, and I thought it was pretty standard practice to build a monol

I'm pretty sure DDD was not just Martin's idea and it's still pretty new and evolving even today, and I thought it was pretty standard practice to build a monolith first and the chop into microservices only when you need to. How come you went straight into these things?