Compiler warnings: Deprecated implicit copy constructor / implicit copy asignment operator

With clang10 and -Wdeprecated-copy I get a lot of warnings like

dune-geometry/dune/geometry/axisalignedcubegeometry.hh:135:30: warning: definition of implicit copy constructor for 'AxisAlignedCubeGeometry<double, 1, 2>' is deprecated because it has a user-declared copy assignment operator [-Wdeprecated-copy]
    AxisAlignedCubeGeometry& operator=(const AxisAlignedCubeGeometry& other)

In the concrete case above, it indeed seems like the copy assignment operator

    /** \brief Assignment operator */
    AxisAlignedCubeGeometry& operator=(const AxisAlignedCubeGeometry& other)
    {
      lower_                     = other.lower_;
      upper_                     = other.upper_;
      axes_                      = other.axes_;
      return *this;
    }

is not necessary. I guess the rule of five doesn't apply here since there is no user defined destructor or move constructor. Could we remove it?