While simple views are automatically updatable [1], this does not extend to composite types; that is, if a view constructs a composite type for one or more columns, this column then is not updatable:
> A column is updatable if it is a simple reference to an updatable column of the underlying base relation It would seem simple enough to support composite types if the view column is constructed using row expression in which each field is "a simple reference to an updatable column". As a practical example, this could enable geometric types being exposed at the view layer, but supported in an underlying table by primitive types. [1] https://www.postgresql.org/docs/current/sql-createview.html#SQL-CREATEVIEW-UPDATABLE-VIEWS
