I have complete confidence that Turbine would never require 1000 coms for a heroic TR while only providing 17 per EH Saga. This would completely kill the old content making the epic reincarnation leveling less fun. It has to be a placeholder value.
I am sure they had the best of intentions by trying to simplify how hearts are earned, but that will only work if equivalent effort is required. There should be some way to convert fragments/tokens for the new coms. Perhaps they should start dropping these new coms in chests in addition to end reward for sagas.
I look forward to their response, I hope their response doesn't cause extreme forum embarrassment.