What is the primary role the Soyuz currently fulfills for the Roscosmos program and its partners, despite diminishing reliance from NASA?

Continuing to serve national needs, often flying missions scheduled purely around Russian operational requirements or crew rotations.

Although the necessity for US astronauts to utilize the Soyuz for passage has significantly decreased due to the availability of American commercial crew services, the vehicle has not become obsolete. It maintains its critical function as the primary access route for the Russian space agency, Roscosmos, and its affiliated partners. Missions flown now are increasingly dictated by Roscosmos's internal scheduling, such as specific crew rotation requirements or alignments with the maintenance cycles of core ISS elements, solidifying its role as a dedicated national access system rather than a shared international taxi service.