I don't like the Heal&Shield stat and think it pigeonholes future enchanter designs
Most enchanters already have the problem of being too closely related to each other in their purpose and function; they throw their heals/shields on you, they throw like one steroid on you, and they usually have at least one good, hard CC.
Given that we haven't seen a proper (laning) Enchanter since Nami, and we haven't had any of the enchanters reworked since way before Heal/Shield was even a stat, I can't help but be worried that whenever Riot DOES push one out it'll be bottlenecked into a more 'safe' package because without having a heal or shield, they'll be denied a huge portion of Enchanter items that involve themselves with the stat. And Enchanters are sorely lacking in unique and standout mechanics already, with their great potential heavily dampened by Riot's concerns of being too niche.
I don't think it was an issue when supports had more AP in their items. I know it makes them more obnoxious in solo lanes when they were like that back in the day, but this feels like it's a bandaid more than a proper fix, which would be addressing Enchanter kits directly if you don't want them to be able to go top/mid and just shut all aggression down like Lulu and pre-work Soraka used to.
I'm hoping that when Enchanters finally get the work done on them that they've been waiting far too long for that we can phase the stat out and not prevent new designs from feeling forced to include these two things.