So much this.
I would never fault a healer in expert roulettes pulling even half the damage I might be doing on their job because for the average player that very well could be what they're realistically capable of at that point. That's totally fine! Play more conservatively, hold unnecessary CDs, fail to realize the exact breakpoints for where your AoE and single target may overtake each other - the details are not my concern when it comes to super basic content like dungeons or 24m/normal raids.
If I can run a parse of someone through xivanalysis and at least understand what I think they intended to be doing I'm pretty happy overall. It might mean there are huge, gaping holes in their understanding and execution but that's okay. Those are things to patch up before entering EX/Savage but not necessarily before.