My experience is that monoliths tend to decay over time unless some serious discipline is enforced. It's possible to reference across boundaries, so that happen

My experience is that monoliths tend to decay over time unless some serious discipline is enforced. It's possible to reference across boundaries, so that happens sooner or later. By going down a microservice route, those boundaries are ruthlessly enforce because it's the only way. That trade off may or may not be worth it.