My friend has this to say:
I commented on lack of DPS from DPS before as a healer when it is so bad it makes it hard to heal. This means lack of Aoe damage and even with my input of stun locking 3 times with 3 holy and tossing Aero III aoe for dot, if things die to slow, I burn though Mp too much making it hard to finish the dungeon on future pulls. You really have to be aware and know what jobs can do to some extent to know where there is a weakness.
Sometimes it is tank being under geared is the only reason a healer can't dps. I seen this in a great gubal libray (hard) for relic quest. I got so used to having 4 people in 260+ gear blasting stuff to clear the dungeon in 10-12 mins it was hard to adjust to not expecting the full size pulls. At first I was going to comment to the healer to toss some DPS around but when I checked the PLD having a 180 gear weapon (this place is average entry 210) I would consider this person under geared no matter what armor they had and too hard to make proper pulls and hold hate. If a DF says avg 210, you NEED A 210+ weapon and this should not be questioned. A weapon is way too important even more so since that effects the ability to hold hate and how well you live.
Anyways because of the gear issue all I said was the tank was undergeared for the DF and moved on. Because of having to heal such a thing, I did not care if the healer was dpsing or not. I hate healing undergeared people myself and I would not stress someone out over that, especially when the healer looked new themselves as well and hovering around the minum level entry. I felt sorry for for that healer.
The point of this story was to show why people should do the same. If things are bumpy look to see why and talk about it. It should not be "harassment" in telling someone they should not be gear level dodging the minimum requirements or give advice how to perform better. I had a very high geared BLM one run who would frequently single target dps on 10+ monsters and just casting the strangest rotations. It impressed me when my friend who was able to help the run at a faster pace be 20-30 levels lower per slot and 40 levels lower on weapon (235 vs 275 I believe) Top things off my friend is rather new to BLM and was not exactly performing the best rotations possible but she was doing good enough where I would not comment during a run even if it was a random member and did not know them, since it is hard to tell between good and excellent while doing your own thing. I guess it takes some experience to see if someone is really undermining, compared to the gear they are using, but you should consider a lot of factors before telling someone, like a healer "you need to DPS"
Even if it looks like a healer is standing around doing nothing, if something is making them very uneasy and not sure if the tank will take huge chunks of damage, unskilled warriors tend to have this issue the most, then it is a lot harder to ask a healer to dps. If a healer is new on top of issues like that.. well.. cut people a bit more slack when asking a random healer they have to dps.. please? Reason being is because the tank or the other DPS may make it hard for them to do so.
With that said, me nor my friend have no issues with DPS while healing, even when carrying. However it was not too long ago a group before a maint stuck me on heal only on an expert due to the PLD and other DPS being clueless.