I'm bored when I heal because I need more complex DPS rotations

[Rein_eon_Osborne]

[...]To be fair, you have no way of knowing those aren't the "Green DPS healers", not the Sylphies. If healing became literally Medica 2 spam, the "Sylphies" would be the only ones that would do it.[...]

Cast bar exist. Sound effects exist (hiding VFX will not mute this). Status bar exist. Mini-map for general party member positioning exist. Although one of the biggest giveaway are usually their first line of defense when something (un)expected happens. Or if you're one of those 'maybe evil minmaxer', there's also the 'funky website' to tell the stories we need to discern. If one plays and actually put effort into bettering themselves on a role, they will gain this perceptive knowledge of said role gradually one way or another. So, I have to disagree on 'not having ways to know', that's on the borderline copium IMHO.

"Sylphies" being the one enthusiastic and capable to do the job is certainly not a scenario I'd find believable when there has not been any single encounter of these "Sylphies" that I witnessed where they did not crumble when the first sign of stress/pressure starts to happen in normal content. They straight up don't possess the mental capacity to process all of that at the heat of moment---something that most of these 'Green DPS' tend to have to some respectable degree (excluding Bad Green DPS, they're as bad, if not worse than Sylphies but less common in my experience). I can say this because believe or not, I spend majority of my times in normal contents.