A summary of healer issues

[Shurrikhan]

Three casts of Cure I will have only saved you .5 seconds compared to two casts of Cure II while healing for less (1,500 vs. 1,600), and costing 200 more MP to boot.

It's worse for Cure I than that.

Cure I and Cure II each take up the exact same amount of uptime, as all sub-GCD spells do: They consume... a GCD each.

A cast-time lower than the GCD only allows for more movement, not more uptime.

Pre-SpS, 3 Cure I casts will take 7.5 seconds. 2 Cure II casts will take 5 seconds. (Rather than 4.5s vs. 4s.)

Though I'm also not sure where these MP values are coming from. Cure I costs 400 MP each, while Cure II costs 1000 each. So it'd still be 800 less MP for 3 C1s than 2 C2s.