This, so much.
It becomes major when you then factor in that you're able to combine another oGCD alongside ED and Miasma II in order to free up room for another Broil II later on. In addition to all the Aetherflow abilities, you have Aetherpact/Rouse/Chain/Shadowflare/ET/Deploy/Dissipation and all of the Role action cooldowns you can weave in as well. SCH's ability to doubleweave on demand and maintain DPS while on the move is the primary advantage it has over the other two healers. Ruin II hasn't been updated in order to help balance their DPS out as a result. Miasma II breaks that rule in certain situations.
Also, Pet Actions break all of the above because they're tied to your pet's GCD, not your own. They work on a similar, but wonkier system that is governed by server checks on top of animation lock, but you can still weave them while you're casting your own spells, as long as the spell is on the pet hotbar and you watch your fairy's Embrace casts. In theory, this enables some super heavy micromanagement windows, such as slidecasting Broil II into melee range while commanding Eos to move underneath the boss before popping Miasma II so you can put Excog on the main tank while also telling Eos to use Whispering Dawn and intentionally resetting Aetherflow's cooldown just in time for you to pop it in that same two GCDs while enabling you to DPS through a weak Raidwide AoE followed by an immediate Tank Buster. It's ridiculous yet also completely possible to do that with the current system.