There needs to be some serious discussion I think on how to properly balance enchanters as a whole.
I honestly do not believe that the ardent nerfs are going to be the cure all for the issue we find ourselves in, though they will certainly help in the proper direction.
It is my opinion that the root of the problem lies with the enchanter class itself, being that every single one of them is very poorly designed for a pvp environment.
Riot phased out most instantaneous burst from the assassin class but completely ignored the fact that enchanters are on the equal but opposite spectrum with instantaneous "anti-burst," being that of shields, healing, and in certain champion's cases undodgeable silences and single target polymorphs (which is really just a glorified silence)
These champions are poorly designed in a pvp setting where it basically presents the enemy with a lose lose scenario most of the time and leaves a feeling of total helplessness and really makes you question why you even bother to make plays against them or their team at all. They're not fair to play against and are altogether far too non-interactive for the power they currently hold in the game, and I personally believe that the "%heals+shields" stat is just extra toxicity added to that pile.
TLDR, Enchanters are a problem that need to be addressed.