"There wasn't much we could really do with SCH"

[Oshirigami]

I definitely like that this suggestion is more flexible. Having the fairy disappear for 10 seconds is less threatening. Im already used to how it works currently tho and I imagine if I needed to burst heal a dungeon pull that has extended for too long I would be weaving Dissipation 3 times for the same gimmick instead of once. Weaving windows are precious but the new Broil change would probably make this version of the skill really nice.

Yep the idea is that it's not really a buff, more QoL in giving a lot more comfort for progression until you learn the window that you can open up 3 extra aetherflow and have faerie gone for 30s.
Currently dissipation feels really underdesigned. And frankly I think dissipation should increase all potency, not just healing, even if they have to knock 5 potency off of broil to compensate.

While I agree that adding an offensive spender to those gauges would be kinda cool/convenient, it would also lead to another game design issue: people would try to use the offensive spell as much as possible rather than the heal or defensive buff.
It is this exact design issue that led them to remove Energy Drain in 5.0, and then add it back, and then lower its potency.
It's obviously a hard balance for them to find...Unless you put a long recast time on the DPS spell, in which case it doesn't really do anything, as you would basically just use it on cooldown anyways.
For PLD, maybe they found a solution as they said that tanks will be rewarded for using cooldowns at the right time, whatever that means.

You say it like that's a bad thing. If you don't need defensive abilities and can focus on damage, that means your group is doing mechanics well and it should snowball into even faster clearing. They either have to make content so hard that even the fastest clearers have to use more healing resource guage, which means most people can't do it, or more sanely: just design the job skills properly for how their game is played so all players are accommodated.
The fastest clearers use a lot of edrain, but they don't spend ALL their Aetherflow on it afaik.

Though for PLD, they don't necessarily need a damage spender, but they do need an off-tanking one besides Cover and intervention as Cover is 120s cd and intervention while good is just that one lone ability that's up for off tanking as you have gauge.
A 50 gauge spender that makes your next clemency an OGCD and removes the mana cost would be awesome, though it'd surely need some cd as well.
There's no reason why Sheltron shouldn't just transform into an off-tank spender when you have stance off.