Should the mapper `update()` methods be deprecated?

The classes MultipleCodimMultipleGeomTypeMapper and SingleCodimSingleGeomTypeMapper have an update() method, which recomputes the internal state. That method dates from a long time ago, when GridView objects had reference semantics. Nowadays, GridView objects have value semantics, however; updating a mapper therefore requires telling it about the new GridView. This is what @carsten.graeser implemented in !487 (merged).

This leaves the question of what to do with the old methods (update without argument). Should they be deprecated? Or do they still serve a purpose?