DokonaLost

Id imagine they dont do this because one of the support items give you ability haste. the other dmg. If you want more ability haste they want you to go specific items and id imagine that most enchanters heals are already build around not being too over powering late game with cd cap

This is correct. The choice is between more aggressive unique plus ap vs more healing focused and haste. The choice is mildly obfuscated because both ap and heal shield power contribute to the heal/shield strength, but the haste items also have a defensive unique. It is not desired from the design side for all support items to have haste.

PaintItPurple

This is a really confusing comment in this context. Staff of Flowing Water and Ardent Censer are already healing-focused items, so wanting to keep ability haste on that path is consistent with OP's request.

Within the set of healing legendary items, they are aggressive, that's what I meant. Redemption and mikaels are meant to be more defensive and staff and ardent are more offensive.

SeizeTheKills

Has the team considered Aether Wisp instead of Codex? And adding some MS to the items instead? That would still help smooth the build path/item slots required but not give AH.

Yep, we also tried it, but we felt there was too much Movement Speed in the game, leading to a decent amount of movespeed creep. It's certainly not off the table, but was not desired.

FruitfulRogue

I dont' really get why Aether wisp even builds into Lich Bane. It's literally the only item in the game it builds into, and not even a Mythic unlike Leeching Leer.

Because too much power indexed into pure damage stats results in too much Burst damage.