FFXIV invests basically zero time and energy into teaching players how to play well, or providing players feedback within the game itself on how they're actually performing. The game doesn't attempt to teach you basic rotations, doesn't ever really stress the importance of riding the GCD (which remains one of the biggest causes of the DPS gap--a lot of people flat-out just don't push buttons as often as they could), and is set up to insulate players from ever really failing and feeling like what they're doing is wrong. Occasionally it just outright teaches bad habits--Hall of the Novice yells at DPS for multi dotting. SSS dummies are better than nothing but are inconsistent across jobs and don't provide context.
Like, yes PF and DF can be pretty bad, but given the zero effort FFXIV invests in helping players not be bad or even giving them a way to know they are bad it's not really surprising.
With unlock and 11 being the cluster that it is, I'd guess that a lot of people PFing Savage post-echo just skip it. Which is a pity in that 11's the best Creator fight, but also makes sense because it's the fight that is going to be the most confusing to do with inconsistent DPS.
New areas and content are story locked but the new jobs will be in old areas and only require being at least level 50 and owning SB.