To put it this way as someone else put it
"It's better to use Miasma 2 to weave. Plus while the potency is 200 it's slightly higher because it's affected by SPS. Still isn't better than Broil though." (Not my words)
The thing to remember is that broil2 cast and recast is the gcd so there is a potential for clipping there. Miasma 2 is instant and you can weave energy drain with it. You can even look at fflogs and you will that a good amount of the fastest runs, the sch in the group will use miasma at least 15 times.
But other than that in terms of a wishlist:
1. More spells in that could use up the fairy gauge
2. Adjustments to SCH aldo cause its potential to cheese mechanics and lb generation is a bit too strong.
3. Trait that upgrades bio 2 and miasma to something unique to the Sch.
More to come