Honestly you shouldn't trust the healer split.
1) They attempted it with tanks and it has largely failed. They said in Shadowbringers early media they wanted dedicated Tank / Off Tank roles and that hasn't materialized at all.
2) They're not doubling down on the shield / regen dichotomy. Scholars have the same amount of regens as they do shields. Whm's have a beefy shield that's getting an additional charge in Divine Benision. ASTs have the biggest possible shield pre-pull right now. The shown skills for Sage had 4 regens and 2 shields.