I'm not his biggest fan and by his own admission, he's not very knowledgable about the intricacies of healers. I'm honestly not big on any of the streamers but if I had to sit down and subscribe to one, it'd probably be someone like Momo. Saying that the turning point being A3S is pretty fair though, that fight was crazy intense and very fast paced even compared to the rest of the tier. World prog on hand of pain was genuinely quite funny looking back at it. For the first pulls we were genuinely looking for a gimmick as we couldn't believe the damage requirement at first. It took a LOT of work from the entire group to meet that check. I'd say that Faust gets a honourable mention though, you needed to meet a still pretty huge DPS floor to even get into Gordias Savage, I imagine that a lot of people never managed to hit that bar until months, maybe even entire tiers later when they returned with a bunch of gear.
Why stop at trials?
Lets have Stone Sky Sea or even as I suggested years ago, Gold saucer mini games that introduce people into common raid mechanics as a progression from the slice is right++