I believe it. The best place to place a module boundary - and the best format for communication across that boundary - is rarely completely transparent from th

I believe it. The best place to place a module boundary - and the best format for communication across that boundary - is rarely completely transparent from the outset. With a monolith it's relatively easy (if not actually easy) to fiddle with those details until you get them right. With a service it can be very difficult to iterate on this stuff, so unless you're very confident you'll get it right on the first try, it's best to get a bit of experience in the problem domain first.