Look at it a different way: why is our domain model hard to change? Is it, I suspect, mostly because we failed DRY and repeated ourselves at the various layers

Look at it a different way: why is our domain model hard to change? Is it, I suspect, mostly because we failed DRY and repeated ourselves at the various layers? (i.e. our domain model is echoed in our DB, Redis cache, API structure, App structure, stylesheets...) If that's the core problem, it's solvable two ways... an app with no backend, or a front-end that is fully generic serving up a backend that calls the domain model shots.