The unitary limit of a Fermi gas is described here as when the scattering length is comparable or exceeds the interparticle distance. For $ak_F<0$, this is the BCS limit of a weakly interacting Fermi gas. When $0<ak_F<1$, the interaction is stronger and we are in the BEC limit.
My question is how well can we describe the unitary limit of the Fermi gas with a Fermi liquid description? It is my understanding that Fermi liquid theory is just the phenomenological approach to understanding the physical model of a unitary Fermi gas, but if we remain far from the BCS and BEC limits and remain firmly in the world of unitarity, when will this Fermi liquid description fail? I have seen studies such as this that use a Fermi liquid theory to describe the unitary Fermi gas, but I have yet to see a reference which tells me when, exactly, this Fermi liquid description fails.