I prefer more varied tactics actually being viable. Throw Embrava at it wasn't any different than throwing KC DRKs at a problem back in the day. Did you win? Sure. Was it fun? Not always.
Sadly, some people gauge fun solely on how often you're invited to things. While one should never aspire to never get invited to content, situations of "must haves" lead to a lot of exclusion, especially when the job roster has grown from game's original 15 to soon 22. You're gonna have some overlap in spots, and that's okay, but you can't really have situations where one job is completely overlapped by others in everything. SCH isn't in this position. Even if you can sub all Helix spells, they do the most damage with them. They're also the king of regens, even with Embrava in its pending state. They can also do unique things with (de)buffs that not every class can do (without subbing SCH, but then further limited by stratagem recasts).
Is this to say SCH still can't get some new toys? Nope. With the Helix adjustments, I wouldn't say T2s are really needed now. T2 storm spells, on the other hand, could have a purpose. Improve Adloquium and the Animus spells. It's a modest start, but still proof that things can be done while remaining themely to the class. They should just be glad they're not RDM, as I suspect some were waiting for me to bring it up, for how some insist it remains and plays like a SCH-2.
While I agree with your sentiment, currently no other strategy is viable
then killing **** as fast as possible while making yourself immune to it's abilities. When the boss monster is equipped with a JP button that instantly kills anyone around it who isn't sporting an Aegis or Ochain with a maxed PDT/MDT set, then the only way to win is to circumvent the damage system (PD / Fanatics).
For example, take ADL. Now ADL has a bunch of moves that basically kill you while inflicting an annoying status ailment (as if killing you wasn't bad enough). To make it worse, these AoEs all have 30~40 foot ranges and effect everyone on the battle field simultaneously. And just to rub salt into the wound, he will ALWAYS clone himself and each clone will use a TP move together. So not only do you got annoying aoe's that inflict grievous amounts of damage while enfeebling you, no instead you get TWO of those same abilities going off at the same time. If the first one doesn't wipe your backline the second one will, and that's just ONE set of TP moves in a few seconds he'll do another. Lets not get into the stupidity that is dynamis implosion and the utter cheapness that is tera slash. Ohh and if hate changes during the tera slash animation, EVERYONE in the arch from the starting point to the end point is hit with it. I've seen 180 degree tera slash's kill all four melee's who were on opposite sides of ADL.
That's just one stupid NM boss fight. Get into the utter insanity that is legion and it's nothing but PD or die after the first wave. And with the extremely limited time and all the desired drops coming from the final wave, it's a 30m mega zerg or don't bother trying.
Reducing their HP by 10~15% won't change anything about the fight. It's the offensive power of everything
that needs to be lowered. 1600~2000 damage aoe's need to become ~800 damage aoe's. 1000~1400 damage aoe's need to become 500~600 damage aoe's. Their range needs to be lowered to under 20 feet to allow actual healing to take place, some of them need to be 15 feet or less. All forms of Instant Death need to have capped 50% land rate, that way there is a semblance of a chance at survival. Our HP didn't go up by much, neither did our defensive abilities (outside of PD). NM's on the other hand have had their offensive abilities more then doubled (tripled if you take into account the level differences). It's become a situation where you simply can't survive without beating the system itself.