A lot of the main issues with SCH are not being addressed with Endwalker

[GrimGale]

Remove Aetherflow as an ability.

Energy Drain stays an ability (oGCD) has 3 charges, 20s CD, restores 5% MP per use. It grants 1 stack of AF. Deals damage with 100 potency to target.

Or

Energy Drain stays an ability (oGCD) 60s CD, restores 20% MP. It grants 3 stacks of AF. Deals damage with 300 potency to target.

Or

Energy Drain becomes a Spell (GCD) has 3 charges, 1.5s cast, 20s CD, restores 5% MP. It grants 1 stack of AF. Deals damage with a 390 potency to target.

[Rilifane]

Remove Aetherflow as an ability.

Energy Drain stays an ability (oGCD) has 3 charges, 20s CD, restores 5% MP per use. It grants 1 stack of AF. Deals damage with 100 potency to target.

Or

Energy Drain stays an ability (oGCD) 60s CD, restores 20% MP. It grants 3 stacks of AF. Deals damage with 300 potency to target.

Or

Energy Drain becomes a Spell (GCD) has 3 charges, 1.5s cast, 20s CD, restores 5% MP. It grants 1 stack of AF. Deals damage with a 390 potency to target.

I like the idea of the AF/ ED concept getting reversed and instead of AF building up and ED consuming, with heal and dps competing over the same resource, ED builds up and AF skills consume without dps loss.
It fits the theme nicely and it encourages being offensive, same as the Further Ruin concept. Both fit well and both feel more like a tactical balancing act rather than getting outright punished for having more to heal than fairy skills can cover. More heal/ dps synergies instead of getting punished for healing would certainly improve healer gameplay.

[Shurrikhan]

Remove Aetherflow as an ability.

Energy Drain stays an ability (oGCD) has 3 charges, 20s CD, restores 5% MP per use. It grants 1 stack of AF. Deals damage with 100 potency to target.
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Or
Energy Drain becomes a Spell (GCD) has 3 charges, 1.5s cast, 20s CD, restores 5% MP. It grants 1 stack of AF. Deals damage with a 390 potency to target.

Don't these simply replace a once-per-minute obligatory weave with three per minute and no actual offensive/dump option?

If you have to use ED, regardless, it's already siphoning from your offensive ppm budget. In which all you've done is remove further MP / offensive potency options and sacrificed 2 weave slots per minute to do so.