Hi Adel,
"hinfstruct" can handle plants with parametric uncertainty by designing a controller that works well for the nominal case and nearby uncertainties, it does not provide the same level of robustness guarantees as "musyn", which is designed to optimize for the worst-case scenario across the full range of uncertainties. Researchers may use "hinfstruct" in papers for various reasons, such as simplicity, computational efficiency, or because the robustness provided by the local optimization is sufficient for their specific application.
