The biggest negative of Microservices is that it creates hard ownership boundaries. This affects planning - more effort is needed to understand boundaries that

The biggest negative of Microservices is that it creates hard ownership boundaries. This affects planning - more effort is needed to understand boundaries that need adjustment or crossing. This affects execution - needing to cross a boundary comes with inefficiencies and an automatic need to move with synchronization. This affects future projects - service boundary clarity works against flexibility.