I would argue the latter. Why? Because that creates a proper curve without upsetting players who do have the skills to handle such challenges. Dungeons have basically become entirely brain dead content you scarcely need a pulse for. Imagine if they pulled ideas from the higher floors of PotD—where priority mobs need to be taken down quickly, thus breaking up the monotony of AoE spam. Frankly speaking, mass pulls is only the norm because tanks want to feel like actual tanks. If I do a baby 3-4 pull, I won't even need a healer, let alone any cooldowns. Savage shouldn't be where you're developing raid awareness but where you test those abilities. I mean, if Savage were the developing grounds, what purpose do EX Primals even serve? Part of why people disliked how piss easy Susano and Lakshmi were is because it relegated them to pointless content. Omega Normal suffers a similar problem.
Put another way. I shouldn't be able to stand in AoE on any boss in Rabanastre yet I can eat Mateus' cleaves or practically everything the third boss does on Samurai, and heal with Bloodbath. What this does is make less experienced assume they can ignore mechanics. It's among the reasons people try to brute force so much. The game allows you to in virtually every piece of content. Weeping City remains a perfect example of what happens when the devs finally stop coddling. People got over it because they had to. Sure, plenty were carried but plenty others weren't. It doesn't help FFXIV does jack all to teach you an endgame rotation—which segues into another issue: if content is so easy Dragoons can get away with spamming 1-2-3-4-5. What incentive do they have to get better?
- Leveling dungeons should be the entry
- Expert should smack people for standing in AoEs and push tanks/healers who try to pull everything that moves (Make this a reward for when you start to outgear content)
- Normal mode trials should test mechanical awareness and CD management. (Garuda, Sephirot, Nidhogg and Shinryu normal are decent examples)
- Omega Normal push players harder (Comparable to what Lakshmi EX was for say, Exdeath. Titan Hard mode is another good example)
- 24 Mans should focus on mechanical awareness (Weeping City did this well)
- Extremes should be preparing players for Savage
- Savage is where you take all that knowledge and put it to the test
Currently, the vast majority of content I just listed is faceroll. People unwilling to improve shouldn't be rewarded. You want the best gear? Put in the effort to get it.