Only if you use a single, concrete data model. If your domain supports the use of something like event sourcing, your "data model" is surprisingly easy to chang

Only if you use a single, concrete data model. If your domain supports the use of something like event sourcing, your "data model" is surprisingly easy to change. Or in this case, is = are, and data model = data models, and they're actually derived from your domain events, which can be replayed. At any time.