Having played tank, healer, and DPS for a long time, I'm always amazed there are so many people willing to advocate for tiny pulls...

When I tank, I pull big, even in leveling dungeons. 95% of the time, the DPS are desperate to get out of the dungeon faster, just like I am. No one wants to sit around spending 30 minutes in a dungeon you could finish in 15 or 20 instead, and if you have solid AOE DPS in your group, pulling less is a statistical DPS (and therefore also time) loss. Moreover, most dungeon mobs, even when your gear is slightly below the dungeon's level, don't hit hard enough for a qualified healer to worry about. Case in point: I went through the Sirensong Sea dungeon doing maximum-sized pulls without tank stance at all just to test it. Neither my FC's WHM nor AST had any trouble keeping me up, and no one in our FC (me least of all) claims to be an incredibly talented player. Yet PUG healers have let me die in smaller pulls with tank stance on and in full vit gear in that same dungeon... Saying this as someone who also heals, healers who struggle to keep up in leveling dungeons might want to look at what they're doing too before automatically jumping to the conclusion that a wipe is the tank's fault for pulling too big. Amazingly enough, it is entirely possible for a wipe to happen on a big pull and have it not be the tank's fault!

Another example: needed Bardam's Mettle the other day, but our FC healers weren't on. Decided we'd go with a tank and two RDMs, just to see what would happen. I started out making small pulls, thinking it would be too hard for them to keep me up, but that wasn't the case at all, and I was able to go back to doing big pulls without issue. It took us a tiny bit longer than normal because the DPS had to help heal, but we had zero wipes. Then I ran it again and did the same exact pulls with both the RDMs and a PUG healer... And we wiped on the very first more-than-one-pack pull because my RDMs trusted the healer would... you know... heal. It wasn't that I was pulling "too big" for myself or the DPS; the healer was just plain out bad. And yet what did this person have to say? "Thanks for wiping us tank, don't pull like that if you can't handle it!" Me and the RDMs just busted up in Discord. Of course I was gracious and didn't insult the healer back in any way (in fact, I accepted the blame even though it pissed my DPS off), and proceeded to pull less to suit this healer. Then they proceeded to wipe us on a pull with just one pack of mobs. But you can bet I did so grudgingly, with the knowledge that this person's low skill level literally cost me more time than if they hadn't been there at all.

And the same is true when I heal and have to PUG tanks. 90% of dungeon pulls, even big ones, can basically be slept through if minimal effort is put in by the healer. Largesse->Aspected Benefic/Regen->Profit. Are there hard-hitting mobs thrown in there too? Add your second regen. (I'm sorry SCH, I'm too lazy to list your moves too.) Then DPS for days. Is the tank under-geared or not using cooldowns? Okay, DPS a little less. Problem solved. As a healer, I would far, far prefer being a tiny bit challenged than literally falling asleep because the pulls are so tiny I'm not even needed to heal. Last example, promise: Wanted to go from 60-61 as AST last night and was sick of PotD, so me and my DPS retinue (yes, they're riding my short queue coattails) queued for Sohm Al HM three times. All three times, we got tanks doing tiny pulls. Tiny pulls, in Sohm Al HM! A dungeon that wasn't even hard on the day it came out! The tanks weren't even new! In one instance, one of my DPS asked the tank "Pull more?" to which the tank declared "I decide the pace." Ahaha, nope. You can bet I told my DPS buddy to pull everything he could and then proceeded to easily heal him through it. Because if you don't want to keep up with the pace the majority of your party wants... Well, you can't blame that majority of the party for moving on without you.

tl;dr 'cause I had too many examples on this issue: It's very rare to find a group where more than one person wants to go slow, and in DF, I always assume that the default pace is "as fast as possible." If someone can't keep up at all, yes, you do have to adjust--but the person who couldn't keep up should really take the time to re-examine how they're playing the game, because dungeons, at any level in FFXIV, aren't hard.