diff --git a/src/core/convertible_through_base.hpp b/src/core/convertible_through_base.hpp
index 11a1051033..813b691341 100644
--- a/src/core/convertible_through_base.hpp
+++ b/src/core/convertible_through_base.hpp
@@ -29,26 +29,6 @@ concept ConvertibleThroughBase = requires(T const a) {
 template <typename T, typename TTo>
 concept ConvertibleThroughBaseOrTo = std::is_convertible_v<T, TTo> || ConvertibleThroughBase<T>;
 
-/**
- * A sort-of mixin that adds 'at(pos)' and 'operator[](pos)' implementations for 'ConvertibleThroughBase' types.
- * This to prevent having to call '.base()' for many container accesses.
- */
-template <typename Container>
-class ReferenceThroughBaseContainer : public Container {
-public:
-	Container::reference at(size_t pos) { return this->Container::at(pos); }
-	Container::reference at(const ConvertibleThroughBase auto &pos) { return this->Container::at(pos.base()); }
-
-	Container::const_reference at(size_t pos) const { return this->Container::at(pos); }
-	Container::const_reference at(const ConvertibleThroughBase auto &pos) const { return this->Container::at(pos.base()); }
-
-	Container::reference operator[](size_t pos) { return this->Container::operator[](pos); }
-	Container::reference operator[](const ConvertibleThroughBase auto &pos) { return this->Container::operator[](pos.base()); }
-
-	Container::const_reference operator[](size_t pos) const { return this->Container::operator[](pos); }
-	Container::const_reference operator[](const ConvertibleThroughBase auto &pos) const { return this->Container::operator[](pos.base()); }
-};
-
 /**
  * A sort-of mixin that implements 'at(pos)' and 'operator[](pos)' only for a specific type.
  * The type must have a suitable '.base()' method and therefore must inherently match 'ConvertibleThroughBase'.