The balance issue of all these heal/shield items.
The upside to the whole "utility scaling" change was that enchanters could buy one stat and know that not only are their shields stronger, so is everything else in their kits. By forcing enchanters to build stuff like
(and to a lesser extent
and
since they still give AP) it ultimately makes every champion that synergizes with these items feel less impactful in every avenue except their shielding/healing. This can potentially lead to a lot of homogenization issue.