The no-healer keys are back in Dragonflight Season 2 with some initial +24 keys being completed without a healer in both Brackenhide Hollow and Halls of Infusion.
No Healer +24s
A team has started early with no healer keys in Dragonflight Season 2:
Protection Paladin: Zephyrindark
Shadow Priest: Boboon
Devastation Evoker: Doomo
Retribution Paladin: Lunatalli
Feral Druid: