Actually, a good question related to this:
What would be the downside of Deployment having a much shorter (20-30 sec) CD like Emergency Tactics does?
It would let you put out bigger (Adlo) AOE shields more frequently, but you wouldn't have the guaranteed crit and it would still cost you a GCD and 1000 MP for the Adlo. Would this really be overpowered? It would still be optimal in most content to hold Deploy for emergencies and use your oGCD healing/mitigation tools instead for more minor damage. It would be a crutch for novice healers, but that's not really a bad thing. And a short CD could allow it to work like PvP where it can be used offensively and defensively since, say, a 30 sec CD would still allow you to line up every 3rd Deploy with a Recitation.
I'm just asking since I'm not really sure, but what are the pros/cons to just having a 30 sec Deployment Tactics that can work with both Adlo and Biolysis?
EDIT:
The SIMPLEST answer - not necessarily the BEST, mind you - would be to cut the power of oGCDs by about 75% and cut the power of GCD heals by about 50%.
Then have boss damage be split to half of what it is, but happen twice as often, not stacked all at once. Where an encounter might now deal 100% of the party's health over 5 seconds and two back-to-back attacks with 20 seconds between the two double attack sets, change it to where it does 25% each attack, but attacks come every 10 seconds instead. (Just as an example). So instead of 50% (t=0), 5 sec later 50% (t=5), 20 sec later 50% (t=25), 5 seconds later 50% (t=30) vs 25% (t=0), 10 sec later 25% (t=10), 10 sec later 25% (t=20), 10 seconds later 25% (t=30).
If both of these were done, it would result in a greater need to pair GCDs heals with oGCDs, and require more breakup of the spam filler to cast those spells.
For harder content, this would be increased. Say for Extremes, it would be 35% and for Savages 45% or even 50%, with those bigger spikes REQUIREING planning out those oGCDs to pair with the GCDs, sort of like how Tanks will often pair their 30 sec mit with one of their 90 sec mits to mimic the effect of using their 120 sec big mit.
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Note again: I'm not saying this is the BEST way, just that this is _A_ way. It doesn't take a lot of effort to consider ways to do this.