Room configurations change. A theater show might convert rows to tables, a festival stage might get rebuilt, or a section might come out entirely. Seat relocation lets you move ticket holders into new seats when the room itself is reconfigured, instead of canceling tickets and starting over.
Because it lives inside Reserved Seating, relocation works against the same seat maps your box office already uses for holds, kills, best available, and table sales. When the room changes, the tickets already sold change with it.