You absolutely could implement a turbine rather than an orifice to drop the pressure of the fluid in a phase change cycle, and in doing so you would recover some energy that is otherwise lost. However the added complexity and maintenance overhead is not worthwhile in many real world situations such as domestic refrigerators.

Thermodynamic efficiency is only one of several competing criteria. Another commenter already mentioned that the size of heat exchangers is massively lower in a system with liquid than a purely gas heat cycle. This is far more important than you might think, given the packaging constraints of say a domestic refrigerator.