Address comments.

metricflow-semantics/metricflow_semantics/model/semantics/linkable_element.py

@@ -220,13 +220,6 @@ def metric_reference(self) -> MetricReference:  # noqa: D102
     def reference(self) -> GroupByMetricReference:  # noqa: D102
         return GroupByMetricReference(self.metric_reference.element_name)
 
-    @property
-    def join_by_semantic_model(self) -> Optional[SemanticModelReference]:  # noqa: D102
-        if len(self.join_path.semantic_model_join_path.path_elements) == 0:
-            return None
-
-        return self.join_path.semantic_model_join_path.last_semantic_model_reference
-
     @property
     @override
     def derived_from_semantic_models(self) -> Sequence[SemanticModelReference]:

metricflow-semantics/metricflow_semantics/model/semantics/linkable_spec_resolver.py

@@ -286,6 +286,7 @@ def get_joinable_metrics_for_semantic_model(
                 f"last join path element: {using_join_path.last_semantic_model_reference.semantic_model_name}",
             )
             # Temp: disable LinkableMetrics with outer join path until there is an interface to specify it.
+            # The result's properties = properties.union(frozenset({LinkableElementProperty.MULTI_HOP}))
             return LinkableElementSet()
 
         path_key_to_linkable_metrics: Dict[ElementPathKey, Tuple[LinkableMetric, ...]] = {}