Emergency Tactics is great, but...

[Dregenfox]

I'm not sure what to answer.

Yeah, ruin 2 is pretty bad but it's still an instant casted spell, if you're moving away from a target it's the only weave option available. Though I'm not sure about the sanity of those who actually do this. It can get somehow a little worth you use energy drain on something else on it. And it doesn't cost a lot of mana
Miasma 2 on the other hand is good. It 100 potency on hit et 100 potency over 12 sec, there's no reason to use it when you want to cast an instant and bio 2 is already up. I'm not sure why you would want to consider weaving with addlo but not that.

And ET is now 20 sec CD. And it's basically one of the few thing you can fire if your co-heal can't save life. Not sure why you wouldn't use that on prog'. It seems you're talking without taking 4.06 changes into consideration.

ET only has a use if you know the DPS aren't going to take any damage within 30 seconds. Otherwise all you're doing is trading a shield for more hp that will disappear to the equivalent value of the shield.

Ruin II is a 130 potency loss every time you use it...so it's better to just not weave unless you can chain at least 2 oGCD's in that time period.

Miasma II is nice but has several conditions - you have to be next to the boss, it's still a 30 potency loss, and it also costs ~1700 mana. In savage it's really not worth keeping the dot up since mana becomes an issue.

The biggest issue is still that SCH has to take 3.25 seconds to do what a WHM can do in 2.5 seconds, as well as paying a ton more mana. Giving some sort of heal bonus to ET would make it not as punishing to use.

Honestly there's only a couple spots in o3s/o4s where using ET even makes sense, which makes the 20s cooldown sort of pointless...