Gauging job performance - how to measure them all?

[synesthetic]

2 things about that:

First, I always strive to keep stoneskin uptime close to 100% on everybody exclusing tanks for most of the run, except on bosses. That's called preemptive healing. When you apply stoneskin applied out of battle, the MP is almost INSTANTLY recovered, so it's like you got a FREE heal before the fight even started. Why the HELL would I refrain from using this? I also always precast a SS on the tank when I notice the fight is about to end (meaning, the last mob only has a bit of HP) for the same reason. MP recovery out of battle is good enough as to render Stoneskin almost free. So, before judging healer performance, perhaps you'd like to know a bit more about the job...

Second... I have an issue with your stance on both healers and tanks being "bad" and "not worthy of comms" if they don't speedrun. Speedrun never was, nor should be the default. Not everybody in this game have iLvl 120+, not everybody in this game want to rush dungeons. Some of us are even doing them for the first time. Some of us LIKE to do dungeons and don't see them as a chore they wanna get over with ASAP. pushing people into speedrunning should NEVER be seen as positive behaviour, and much less NOT wanting to speedrun be deemed negative behaviour. Please review your concepts.

Don't misunderstand me by adding in things I did not say.

For stoneskin, I've seen healers not using it for preemptive "healing". I've seen it used as a substitute for healing, and I've seen it used as an excuse to have something to do in all of the time they stand around when they don't need to heal (especially in boss fights). In the latter case, that's fine, as long as they're not running out of MP because of it and then let someone die.
Is there ever a case where you need to maintain stoneskin on everyone in order to keep everyone alive? Almost never, and especially not outside of a raid. Time and MP can be safely spent on other endeavors.

If you keep everyone alive, you've done a passable job as a healer. Regardless of how efficient or not you are with your time and MP.
But I am not going to comm someone for doing a passable job. The commendation system is there to give kudos to people who impressed you. Passable does not impress me. Sorry.
Does that mean I think they're not "worthy of comms"? No, because that's stupid to think that your own subjective form of judgment should be unanimously shared by everyone. They're just not getting my comm.

I don't believe I said anywhere that anyone has to speedrun in order to be "worthy of comms", or that they're "bad" if they don't.
Did I say a tank has to make a large pull? No. If they do though, then they'd better do a good job of it.

Note that one of the first things I said in my post was "I gauge healer performance by how they use their time, and how much they demonstrate team play." This applies to more than just healers, and all of my points are related to it.
Like in WoD, am I going to comm the BLM who went out of their way to get into a meteor point, or am I going to comm the healer who stood right next to it and is just occasionally curing the tank?
Or the dungeon I was just in. Am I going to comm the healer who was spamming Succor when only the tank was getting hurt, or am I going to comm the Ifrit-lance DRG who's at least trying to AoE like his life depends on it (and it does) when most melee DPS I see will still single-target in the face of 8 monsters? He didn't do much damage owing to the i60 weapon, but he got my comm. We didn't die, so the healer (or the fairy) did a passable job. Am I going to gripe if they get a comm when I didn't think they were anything special? No.