I'd be lying if I said that awful parties had no effect on my DPS potential but I think you're overstating things quite significantly. In dungeons, it really doesn't make that big a difference, I've hit 3.8k average DPS in incredible groups that you'll likely never see in a solo queue, and I've hit 3.8k average DPS in slow groups that I've pretty much dragged along by the coat tails, you've seen me link these logs here in this very thread so I'm not really sure how you can say this is as big an issue as you suggest. For raids, I'd honestly say that staying focused is the bigger problem, knee jerk raises can be dangerous if you habitually fire them off at a bad time.
See for yourself:
https://www.youtube.com/watch?v=wAJ9InV3-MI - Log
The MT was in my group, my co healer died 7 times and there were 33 deaths overall. For a comparatively tame and trivial encounter, that fight was utter carnage. I wasn't playing especially great but managed 1.2k dps aka 69 percentile out of that with plenty of room to do better if I had have been more focused.
No, but by knowing the timing of the script and being aware of what's happening around me. I can be prepared for when things go wrong and more importantly, I can ensure I react appropriately rather than excessively.
Case in point, in that clip above, look at 2:05. The BLM in slot 7 gets clipped by a plume 2:08 and my co healer dies for the second time, on one side of the coin, I know that I'm the only one that's going to heal them, on the other side of the coin, I know that there's literally nothing coming for another 20 seconds or so. I finish my DPS casts and lazily throw a regen at them. Lo and behold, they are almost topped by the time the next mechanic comes along which they also fail, cry of victory at 2:28. Ironically, the earlier regen has them back up to about 25k hp before the 3rd mechanic comes along which they also fail, trample at 3:35. This time they take a 62k one shot.
Who's the bigger fool here? The player who failed 3 consecutive mechanics or the healer who would have pumped them full of cure IIs and still had a dead blm at the end of it? (And before anyone suggests it, I don't begrudge any of the people who died there, that Chariot was horridly placed leading into a very awkward Cry>Trample combo for anyone who didn't see it coming).
Oh come on now, this is a bit of a silly statement no? You show me an undergeared tank pulling wall to wall that neither has gear nor can hold agro and I'll show you a party wipe, this is a bit too extreme to be a reasonable example and has zero relevance to this thread.
However, since you asked nicely: The most undergeared tank I've ever experienced, I didn't record a video of this run, but the numbers should tell you all you need to know. He had less HP than me and his DPS was rock bottom due to both his gear being poor and a good portion of what he did have being broken to really round things off. Yes I did have to adjust and go a little easy to ensure I kept him alive and didn't pull everything off him in the process, but even so I still managed 900 DPS which isn't too shabby for a 60/ilvl 240 cap dungeon.
So no, at least as far as casual/mainstream content goes, why would I be less likely to DPS when I can typically just throw a regen and roll my eyes some in the majority of situations? It's all about learning to apply an appropriate amount of healing for the situation at hand rather than dropping everything to bomb them with Cure IIs.
This is a different discussion altogether no? Ice Mages don't bother me one bit in Rabanastre, they are a minor annoyance in Dungeons (more emphasis on multi dotting coupled with steady pacing on my holys and it's not a problem) and they have no place in anything with an enrage timer. Ps most mainstream content doesn't hit enrage, so I'm not really sure why you're making a point of this? No one here is defending Ice mages that I can see?
Modest is a relative term here and it can vary depending on the context. 2K DPS from a healer in a dungeon is 'modest', yet the same damage in a savage raid is very solid. Let's be realistic here, there's nothing modest about an 88.6% active rate on UCoil. 860 DPS whilst also throwing out 9.2k HPS in the by far the most convoluted encounter this game has ever thrown at us? I absolutely concur on the epic verdict
For sure, you've almost certainly seen me preaching from the rafters about being open minded and willing to push the boundaries when they are there for the taking. But knowing how to keep things going and apply measured healing without dropping the ball is just as useful a skill as being able to spot and react to a problem in the first place.
Again, I'll stress these things aren't something that should be expected of everyone, but rather it's a standard of play for people to aspire to, myself included.