On dependency in double-hurdle models

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A double-hurdle approach to modelling tobacco consumption in Italy (2008, background): “10 Smith (2003) puts into question the relevance of the dependent double-hurdle model itself, asserting that this model contains too little statistical information to support estimation of dependency, even when dependency is truly present.”
Technology adoption under seed access constraints and the economic impacts of improved pigeonpea varieties in Tanzania (2008, background): “Smith (2003) shows that assuming dependency between the two equations is not a worthwhile exercise as there is little statistical information available to support dependency in a DH framework.”
The Impact of Access to Credit on the Adoption of Hybrid Maize in Malawi: An Empirical Test of an Agricultural Household Model under Credit Market Failure (2006, background): “5 See Smith (2003) for a theoretical analysis of why there might little gain from modeling dependence”
A zero-inflated ordered probit model, with an application to modelling tobacco consumption (2007, background): “…and regression equations is identified by the nonlinearities involved, due to multicollinearity concerns, this correlation is often imprecisely estimated if x z. Smith (2003) also suggests that identification of the correlation parameter may be stronger in samples with more than 50% zeros.”