If you can replace the whole system, yes. It's most of the case for early statups where you have only a few developers communicating intimately. When you writ

If you can replace the whole system, yes. It's most of the case for early statups where you have only a few developers communicating intimately. When you write components used by multiple groups, things get far more complicated; you have to provide some stubs so that other party's old code keeps working until they finish migration. Here, at least doing protocol right is essential. (Web app has advantage here, since you can just ride on existing protocols.)