Ugh, this lacks any contextual reason on why one is better than the other. Dirty checking a model requires a direct comparison on every digest loop, regardless of whether or not the state has changed (because we don't know if the state has changed).

React runs its dirty check only after a state change obligates it to. As your model gets larger and larger, dirty-checking the model on every digest loop starts to have performance problems.

Oversimplification can be incredibly misleading.