I'm going to add to this a soft theorycraft Scholar rework to showcase how we could recreate numbers similar to the ARR numbers while achieving the same total potential potency of modern-day Scholar.
Theorycraft Scholar
DPS Spells*Note: Fester detonates Virus stacks applied by Bio III and Miasma III. Each spell can only apply 1 Virus at a time. This will lead to some instances of single stack detonation when multiple Bio IIIs would be cast before the next refreshing of Miasma III.
- Broil IV - 150 potency
- Bio III - 70 potency DoT over 15 seconds (350 total potency). Applies 1 stack of Virus; only 1 Virus can be applied by Bio III at a time.
- Miasma III - 100 potency + 60 potency DoT over 24 seconds (580 total potency). Applies 1 stack of Virus; only 1 Virus can be applied by Miasma III at a time.
- Fester - 100 potency on targets with no virus stacks. 240 potency on targets with 1 virus stack. 510 potency on targets with 2 virus stacks.
- Shadowflare - 75 potency DoT over 30 seconds (750 total potency)
2 Minute Potency Potential
- Bio III - 8 casts = 2800 potency
- Miasma III - 5 casts = 2900 potency
- Fester (1 Stack) - 3 casts = 720 potency
- Fester (2 Stacks) - 6 casts = 3060 potency
- Shadowflare - 4 casts = 3000 potency
Total Non-Broil IV Potency Potential: 26 casts = 12480 potency
Remaining Broil IV Casts: 22 casts = 3300 potency
Total Possible Potency in 2 Minutes: 15780 potency
Non-Broil IV Contribution: 79.1~%
Broil IV Contribution: 20.9~%
Value per Broil IV: 0.9~%
Summary
As you can see, this theorycraft offers the same exact total potential GCD potency in a 2 minute window as the current Scholar kit offers, yet by restoring some of its old toolkit elements, and adopting Fester as an extra burst button, we've recreated a very similar metric to what ARR Scholar used to have.
Now, this is still using DoTs with multiple durations which does feature precise timing--something I mentioned above that can be tricky to the less experienced healer. I do think there is a place for a more precise optimization type healer like this in FFXIV, but we can also accomplish this on another healer with more flexible and relaxed offensive spells, things that allow you to cast them at times that are more convenient to the healer. Spells that have charges, that are procced off other spells with charges like with Red Mage's Verflare/Verholy > Scorch > Resolution, or other types of attacks that have comfortable windows to be used rather than enforcing use at specific moments. And I firmly believe we should have at least 1 healer like that if not more. But that healer's additional attack spells can create an environment where it's easier for a novice to get much farther with their overall DPS output rather than restricting that healer to a single spell that has a doubly steep cost for every instance of that spell you lose.