As a longtime support main I honestly think Kiriko is fine, but Illari is just far too lethal as it is right now and needs some serious tweaks to be in line of being a SUPPORT character and not just a dps masqerading as a support thanks to poweful healing she can set and forget.
As it is rn, she feels like if they took the lethality of a character like Soldier and just buffed up his healing field to actually be a primary healing source rather than a background feature. At least Zen, the prior most damage oriented support, had an ult that was SUPPORTIVE and wasn’t just a cc damage burst.