Rather than a maturity model, DORA use metrics and a capability model. The idea is you use the metrics to decide on which capabilities to focus on. This tailoring to your context is the great thing about it - it's what you mention when you talk about determining the capabilities per-org... that's why you'd choose a capability model, not a maturity model. Maturity models seek to standardize the practices globally, rather than leaving room for customization.

I guess... we're pretty much in agreement - except perhaps over the definition of the two types of model :)